Lando Norris Autograph Request, Michigan Businesses Permanently Closed Due To Covid, Oxytocin Function In Cattle, Wines Similar To Boone's Farm, The Vscode Server Failed To Start, Articles I

A beluga whale, also known as the white whale, or the sea canary, is a species of whale that belong to Genus Delphinapterus, Family Monodontidae, and is found in the Arctic and sub-Arctic waters, the United States, the state of Alaska. : The humpback has the longest flippers of any whale, and they lie substantially forward of the whale's center of mass, well placed to exert turning forces on the whale. produce few, but well cared for young no external ears Millions of years of adaptation to the sea have made seals expert swimmers and divers, but they are quite awkward on land. No claws, no hind limbs and no external ears. 'not all seals are the same: some swim with their front flippers while others propel themselves with their back feet' More example sentences A flat rubber attachment worn on the foot for underwater swimming. But food was abundant in the seas. They contain no . build large messy nests along coast out of anything they can find, long-necked coastal diving birds The adult male walrus weighs more than 2,000 pounds. It grows up to 13 feet long and weighs up to 1,300 pounds. spend months-years at open sea This marine mammal is the smallest known Cetacean, a Cetacean is a group of mammals including whales, dolphins, or porpoises. A flipper is a broad, flattened limb adapted for aquatic locomotion. As an Amazon Associate I earn from qualifying purchases. A flipper is a broad, flattened limb adapted for aquatic locomotion. They have all the skeletal elements of the forelimbs of terrestrial mammals, but they're foreshortened and modified into paddle-shaped appendages. They have broad, paddle-like flippers and notched tails. dorsal fin while the prominent, large, round, and flat-shaped tail is used for swimming. No claws, no hind limbs and no external ears. The Dugong is a large, grey brown bulbous animal with a flattened fluked tail, like that of a whale, no dorsal fin, paddle like flippers and distinctive head shape. Instead of having wings like other birds, penguins have tapered, flattened flippers for swimming. (1) Hair-clad, mostly terrestrial, air-breathing, warm blooded, viviparous, tetrapod vertebrates. pectoral limbs modified into broad paddle-like flippers. Humpback whales are a favorite of whale watchersthey are often active, jumping out of the water and slapping the surface with their pectoral fins or tails. Also called: fin (often plural) either of a pair of rubber paddle-like devices worn on the feet as an aid in swimming, esp underwater. Surprisingly, Sea lions use flippers for steering and hind flippers for propelling and combinations of both to attain a maximum speed of about 30 mph. The tubercles on the flippers of humpback whales improve the hydrodynamics of the flipper at their size. Answer (1 of 2): #NotAllPenguins The ones that do gather pebbles generally do it to build nests in areas where other methods won't work. Baby gray whales average 15 feet in length and weigh about a ton. Add a one-line explanation of what this file represents. What Is the Difference Between a Sailfish & a Swordfish? The process continued over time, and a very derived form of hyperphalangy, with six or more phalanges per digit, evolved convergently in rorqual whales and oceanic dolphins, and was likely associated with another wave of signaling within the interdigital tissues. noise. They are closely related to manatees, and they never leave the water. Or, as we prefer to call it, GHOST HAND. prefer warm water and will migrate to it This is accompanied by a body morphology particularly adapted to movement in a liquid medium. theia group stock Paddle-like flippers The wings are modified into flattened broad bones with the joint of the elbow and wrist almost fused. feather are not waterproof, most diverse group of sea birds Whales lack back limbs and external ears. Ornithorhynchus (Duck-billed Platypus): It lays eggs in the nests. Surprisingly, The combination of strong flippers and flukes helps to reach a speed of about 56 kmph. Fortunately, They have thin and long flippers that are perfect for swimming through the water. Whale skulls have small eye orbits, long snouts (with the exception of monodontids and ziphiids) and eyes placed on the sides of its head. Cetacea : (Gk. air sacs in the blowhole make low frequency noise that can be changes (low- landscape, higher- directed when chasing prey) dorsal-ventrally flattened tail/ fluke While moving on the land, They flap its two fore-flippers and sometimes use its tusk to move forward by using them as an anchor on the ice surface. A walrus, including the Atlantic walrus, the Pacific walrus, is a large-sized ocean mammal that belongs to Genus Odobenus, Family Odobenidae, and is found in the North Pole, the Pacific Ocean, Atlantic Ocean, and the Arctic Ocean. sp. The living Cetacea are divided into two suborders Odontoceti (toothed whales) and Mysticeti or . Sed vehicula tortor sit amet nunc tristique mollis., Mauris consequat velit non sapien laoreet, quis varius nisi dapibus. their front limbs modified to pectoral flippers (an elongated paddle-shape in the blue whale). Use rear flippers as paddles and fore flippers to steer Cetacea: Whales, Dolphins, Porpoises. Most odontocetes also reduce the number of phalangeal elements in digit V, while mysticetes typically retain the plesiomorphic condition of three phalanges. Surprisingly, The combinations of flippers and tail flukes help to attain a maximum speed of about 25 kmph. Large rounded tubercles along the leading edge of the flipper are morphological structures that are unique in . commercial and recreational fisheries, oil and They have broad, paddle-like flippers and notched tails. 4. Its triangular-shaped hind flippers contain five digits made of bone. Fish & Wildlife Service Marine Mammals Management: Sea Otter. Accetta luso dei cookie per continuare la navigazione. Subjects. A humpback can measure up to 19 meters (62 feet) long. Paddle noun A two-handed, single-bladed oar used to propel a canoe or a small boat. manatees and dugongs ), and marine reptiles such as the sea turtles and the now-extinct plesiosaurs, mosasaurs, ichthyosaurs, and metriorhynchids . All four limbs are modified into paddle-like flippers, and the long tail has a fluke at the end. A vaquita is identified by its triangular dorsal fin, triangular flippers, rounded head, and eyes, and lips with unusual black patches. This made it hard for the keepers to take care of it. Our mission at Wildlife Informer is to share free information and pictures of wildlife with our readers. Dalls porpoise has a thick robust body with relatively small flippers. A fish is a water-dwelling vertebrate with gills that doesn"t change form, as amphibians do, during its life. . melon in forehead full of waxy oil (spermaceti organ- looks like sperm, huge in the sperm whale- where it gets its name; sperm whales can emit a sonic blast that can stun/ kill prey) collects rebound waves and directs them to the inner ear, some of the most complex brains All living whales lack hindlimbs and have forelimbs modified as flippers. Instead of having wings like other birds, penguins have tapered, flattened flippers for swimming. Flattened limb adapted for propulsion and maneuvering in water, Learn how and when to remove this template message, "Why Did Penguins Stop Flying? Various bone joints of the limbs lose their mobility and the entire structure acts as a single unit. In whales, forelimbs are modified into fish fin-like structure, called flippers. Placodonts a. mollusk-eating reptiles b. paddle-shaped flippers c. pavement-type teeth in jaws and palate (shell crushing function) Plesiosaurs a. first appearance during Jurassic b. short, broad bodies with flippers, small heads c. long-neck and short-neck forms d. slender curved teeth (fish-eater) e. examples (i) Elasmosaurus (Cretaceous, 12 . "The Living World of Animals"; The Reader's Digest Association. New video reveals these whales flap their flippers like birds flap their wings. The ultimate fate of any one cell--whether it becomes a skin cell, a nerve cell, a kidney cell, or a bone cell--depends upon which genes are read. Cetaceans include all whales, dolphins and porpoises. They also have large front and rear flippers that are used to walk on all fours on land like sea lions. Humpback whales live in all of the world's oceans. 15 Animals With Amazing Tusks (You Need To Know With Pictures), 23 Animals With Opposable Thumbs (+Pictures). These large marine mammals can measure 10 feet long and weigh up to 2,000 pounds. 3. A Manatee, including the Amazonian manatee, the West African manatee, the West Indian manatee, also known as a sea cow, is a large-sized herbivorous marine mammal that belongs to Genus Trichechus, Family Trichechidae, and is found in the Caribbean Sea, the Gulf of Mexico, and West Africa. The history of life: looking at the patterns - Change over time and shared ancestors; Mechanisms: the processes of evolution - Selection, mutation, migration, and more; Microevolution - Evolution within a population; Speciation - How new species arise . Flipper noun The 13 species of sea lions are divided into two groups, sea lions and fur seals. The striking feature of them is their black and white color body with strong flippers, dorsal fin, a fin located on their back, and powerful fluke. Sky hopping: bob at surface to scan the horizon to look for prey on the ice shelf, can then break up ice to knock the prey off Captions 2. Pinnae are absent. Whalebone whales do not have teeth, but plates of baleen or whalebone in their V-shaped upper jaw, which act as sieves or strainers for plankton. There are a couple clues. polyphyletic- multiple lineages Mammals; fore limbs modified into flippers; fluke; blowhole; two suborders: odontocetes and mysticetes; whales, dolphins, porpoises Flippers are one of the principal control surfaces of cetaceans (whales, dolphins and porpoises) due to their position in front of the center of mass, and their mobility which provides three degrees of freedom. They are the largest river dolphins in the world. Elephant seals are large, earless seals that have relatively small flippers compared to their large bodies. tissue are able to tolerate high levels of lactic acid conical interlocking teeth Pectoral flippers are a whale's forelimbs. Our scientists use a variety of innovative techniques to study, protect, and disentangle humpback whales. The living Cetacea are divided into two suborders Odontoceti (toothed whales) and Mysticeti or . Eyes and ears are small reflecting the animal's lack of reliance on these senses. hundred of vibrissae (whiskers) Sea lions have conspicuous external ears. However, no claws are present in any flippers including fore flippers and hind flippers. no external ears Archelon had a wide, flattened shell, paddle-like legs, a long, narrow head, weak jaws, and a short, pointed tail. Whales have torpedo-shaped bodies with non-flexible necks, limbs modified into flippers, non-existent external ear flaps, a large tail fin, and flat heads (with the exception of monodontids and ziphiids). An Amazon river dolphin, also known as the boto, and pink river dolphin, is a river dolphin that belongs to Genus Inia, Family Iniidae, and is found in Amazon, Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela. Their front flippers are positioned close to their small head. : Pinnipeds are aquatic mammals with all flour limbs modified into flippers. eyesight adapted for underwater- poor on land Hemera Technologies/Photos.com/Getty Images. Their average life span in the wild is up to 17 years. Flippers are used for different types of propulsion, control, and rotation. It refers to the fully webbed, swimming appendages of aquatic vertebrates that are not fish. The whale's surprising dexterity is due primarily to its non-conventional flippers, which have large, irregular looking bumps called tubercles across their leading edges. eat bottom invertebrates What is the mass percent of water in this compound? Surprisingly, Its hind flipper has a large surface area that is an advantageous feature to propel through the water easily. The beluga, or white whale, is one of the smallest species of whale. any of an order of sea mammals with flippers church audio visual companies near me assignation pronunciation Navigation. Their wings are modified into paddle like flippers. In this article, we are going to look at animals with flippers. The rostrum is dimpled and bumpy. Habitat triangular dorsal fins While resting they can stay submerged for up to 15 minutes; while swimming they need to breathe at the surface every three or four minutes. The forelimbs of cetaceans, pinnipeds, and sirenians presents a classic example of convergent evolution. A thick layer of oily fat or blubber up to 3 inches thick insulates them by maintaining a body temperature around 100 degrees Fahrenheit. What is an activity series of elements? [9] Hyperphalangy is an increase in the number of phalanges beyond the plesiomorphic mammal condition of three phalanges-per-digit. Humpback whales use their flippers to create a barrier that traps gathered prey, which they can then usher towards their mouths by swatting the water. uaoer UBRAIT NATURAL HISTORY IN ZOOLOGICAL GARDENS Natural History in Zoological Gardens BEING SOME ACCOUNT OF VERTEBRATED ANIMALS, WITH SPECIAL REFERENCE TO THOSE USUALLY TO BE S This forms a tapered, flat flipper for swimming. and the pectoral flippers are broad and paddle-shaped. noun 1 A broad flat limb without fingers, used for swimming by various sea animals such as seals, whales, and turtles. In marine mammals, these dorsally positioned nostrils are called the blowhole. If not, then you are in the right place to know them. Surprisingly, the males of vaquita have a taller dorsal fin height than the female, whereas the females of vaquita have larger flippers than the males of the vaquita- thats really competing and distinguishable features between them. A detailed guide of everything you want and need to know about fish. (7) Respiration by 5 to 7 pairs of gills. Orcas large paddle-shaped flippers are not only used for agility and steering at fast speeds but also used to play. In marine mammals such as whales, a wide flat limb, adapted for swimming. Aliquam porttitor vestibulum nibh, eget, Nulla quis orci in est commodo hendrerit. Some have fins, some have flippers, and some have both. Orca D. Pectoral flippers. View Test Prep - FW 318 Mammal List for studying.docx from FW 318 at Oregon State University, Corvallis. Hindlimbs absent. Over time, they slowly . Penguins propel themselves through the water by flapping their flippers. filter feeders- take large gulps (expandable throat) to capture schools of fish and krill any of an order of sea mammals with flippers budda superdrive 45 head cheapest places to live in south america Navigation. Design an experiment to test the hypothesis that contact of an agar plate with a finger results in more bacterial growth than the exposure of the plate to classroom air. Fin whales also have a grayish white chevron-shaped mark on their backs. Form constrains function, and the wings of diving flying species, such as the murre or cormorant have not developed into flippers. They have a waterproof coat, closable ears, closable nostrils, paddle-shaped tail and webbed feet. Within ten million years, whales were fully aquatic. Another unique fact is that killer whales are called "whale killer." We can all agree that it's easier to flip around the words and call the oceanic mammal a killer whale. 2. ability to turn the hind flippers forward to walk on land 3. smaller than phocids 4. shallow divers preying on fast fish Two Sub Families of Otariidae Otariinae (sea lions) and Arctocephalinae (fur seals) Odobenidae Synapomorphies Family Odobenidae (walruses) Monophyletic group characterized by: It is also known as Tunicate because the body of an adult is enclosed within a tunic made up of cellulose -like substance known as tunicin. 2023 WILD SKY MEDIA. Orcas have been known to throw prey with their tails and flippers. beaked whales, characterized by a snout drawn into a beak inhabit deep ocean basins. They are the only large whale that does not have a dorsal fin. (3) Exoskeleton includes lifeless, horny, epidermal hairs, spines, scales, claws, nails, hoofs, horns, bony dermal plates, etc. Eyes are small, external ears absent and mammary glands are well developed. The flippers of penguins became thicker, denser and smaller while being modified for hydrodynamic properties. found on the coastal NE pacific Analia Giorgetti, who was out on the water on her birthday, says it was "privilege . These mammals are adapted strictly to an aquatic life and may be characterized as follows: small to extremely large, hairless, fish-shaped mammals; front limbs modified as flippers or fins, hind limbs absent except for vestigial internal remnants; eyes and ears small, the latter valvular and lacking external parts; skull telescoped so that . From the gracile and crescent-shaped flippers of a pilot whale, to the thick and door-like flippers of right whales, cetacean flippers come in lots of shapes and sizes (Figure 2, Figure 3) (Howell, 1930; Benke, 1993).Most delphinids have small and thin flippers, except the broad and thick flippers of the killer whale (Orcinus orca).Killer whales display sexual dimorphism in that the male . Hind limbs all but disappeared, as a broad tail fluke evolved for more powerful swimming. Though the flippers of modern cetaceans are not correctly described as webbed feet, the intermediate webbed limbs of ancient semiaquatic cetaceans may be described as such. Toothed whales feed primarily on fish. https://en.wikipedia.org/wiki/Flipper_(anatomy), https://www.britannica.com/science/flipper-zoology. Among turtles, observed behaviors include a green turtle holding a jellyfish, a loggerhead rolling a scallop on the sea floor, and a hawksbill turtle pushing against a reef for leverage to rip an anemone loose. Thus, the front limbs became modified as paddle-shaped flippers, the bones of which are still reminiscent of jointed limbs and digits, but the hind limbs were lost . salt glands in nose excrete excess salt In vulputate pharetra nisi nec convallis. Didemnum . Right Whales appear stocky, with broad paddle-like flippers, a large head (~1/4 of their body length) and no dorsal fin. Beluga whales are small whale species that live in the Arctic Ocean. eggs have hard shells that are resistant to desiccation, spend majority of lives at sea once born calf immediately swims to surface for air The bowhead whale, also known as the Greenland right whale, is about 45-60 feet long and weighs 75-100 tons when full-grown. Their wide flukes have a smooth trailing edge separated by a pronounced notch. PECTORAL FLIPPERS 1. keep warmth- layer of fat, feathers trap air bubbles They are incredibly intelligent and very social animals that live in family groups called pods. The thoracic (rib) cage is well developed, and the sternum bears a pronounced keel for the attachment of the pectoral muscles, which move the flippers. Pectoral flippers are a whale's forelimbs. Found only in rivers in Africa, hippopotami are between 10 and 15 feet long including the tail. In this Article, We discover the Animals with flippers chosen from across the world. From England, France, Germany, and eastern Europe during the late . smallest marine mammal Females return to the same beach they hatched to lay their eggs. They have four flippers, two are fore flippers and two are hind flippers, that contain a brought surface or bottom for providing grip on the slippery snow and ice surfaces. paddle-like, and slightly upcurled at the tips. Forelimbs are modified into broad paddle-like flippers while posterior limbs are absent. Whalebones include the Californian gray whale, rorquals or fin whales, blue whales and the Greenland right whale. 1. the presence of exterior ears or pinnae. Mar 8, 2017 - Adult beluga whales are easily distinguished by their often pure white skin, their small size and their lack of dorsal fin. With its eyes and nostrils set high up on its head, it is often tall enough to stay submerged and breathe at the same time. Show algorithmically generated translations. | Meaning, pronunciation, translations and examples (3) Exoskeleton includes lifeless, horny, epidermal hairs, spines, scales, claws, nails, hoofs, horns, bony dermal plates, etc. cetaceans need to remain streamline- genital slits Whales today do not have feet, so of course they don't have hooves. Other articles where forelimb is discussed: penguin: Form and function: is the transformation of the forelimb into a paddle. The presence of interdigital webbing within the fossils of semi-aquatic Eocene cetaceans was probably the result of BMP antagonists counteracting interdigital apoptosis during embryonic limb development. A beluga whale has broad and short-sized flippers that result in square-shaped flippers. A drone has captured the moment when a paddle boarder had a close encounter with two curious whales in Argentina. 3. Manatees have broad paddle flippers that actually grow nails. Tail divided in two broad horizontal fleshy flukes with a notch, used in propulsion. Zoology. This forms a tapered, flat flipper for swimming. Evolution. Identify the Lewis acid and Lewis base in the following reaction. Its flippers are small, round with an oval shape. 709 the relatively large head and the trunk, and tapers to a notched tail, horizontally flattened into flukes. They have wider flippers that are triangular in shape, especially mature females of the vaquita have larger flippers than the males of the vaquita. The aquatic habitat of marine "air-breathing" vertebrates provides a significant thermoregulatory challenge due to the high thermal conductivity of water. Muskrats are good swimmers and can stay underwater up to 17 minutes, preferring to live in 4 to 6 feet of water. No other integer value should be accepted as valid input, and data entry should stop when a negative value is entered. Bottlenose dolphins are so well-known for their front flippers that a television show aired in the 1960s about a dolphin named Flipper. : We put on flippers to snorkel and recognize turtles and fish from Finding Nemo. The hippopotamus loves water and stays submerged up to 16 hours of the day. The combination of flippers, flexible neck and tail fin helps them to attain a speed of about 16 mph for short distances while pulling their body weights between 1,000-1,500 kg. Most forms have a median dorsal fin. Whales, like other marine mammals, have evolved physiological adaptations that allow them to dive deep. Males have larger bills and white cheeks while females often have gray colored cheeks. Here is a list of thirty-four types of mammals that are found in India. While the flukes are small, and curved with a median notch. The largest of all turtles, leatherback sea turtles can measure almost 6 feet long and weigh over 1,000 pounds. Eyes are small, external ears absent and mammary glands are well developed. They can use their flippers to scratch and groom their thick fur coats. Semiaquatic river otters, like other amphibious mammals, have dense, thick fur and streamlined bodies designed for life in the water. Most are cold-blooded, though some (such as some species of tuna and b. Seals are unable to do this. D. Pectoral flippers. It had a whale-like appearance. no nails Flippers are appendages that marine animals use for moving and steering through the water. Didemnum. They are the rarest of all porpoises. They also use them for steering underwater. . Short wedge-shaped tail No claws, no hind limbs and no external ears. Sirenia- mantees and dugong may live inland and only visit the shore to feed Typically, whales will breathe several times before diving again and then can stay underwater for a period of timeusually 5-15 minutes. Whales Whales have streamlined bodies tapering toward the horizontal tail that distinguishes them from fish. These seals have flippers, fore flippers, and hind flippers. Co3+(aq)+6NH3(aq)Co(NH3)63+. 3 Luglio 2022; common last names in kazakhstan; medical careers that don't require math in sa . They have large flippers that are about 9 feet in length. Cetaceans (whales, dolphins and porpoises) are large marine animals. Whales, dolphins, porpoises, manatee and dugong are completely aquatic; seals, sea lions, walrus, hippopotamus, platypus, otters, beavers and nutria are semiaquatic, spending part of their lives on land. fusiform body plan Their massive flippers look like paddles and keep the animal balanced in the water. Their front limbs have been modified into broad flippers. very good swimmers- remain completely at sea unless they are breeding, found along shores A dugong is a marine mammal that belongs to Genus Dugong, Family Dugongidae, and is found in the Pacific, Indian Oceans, east Africa, the Red Sea, and Australia. homeotherms The flippers of cetaceans dolphins, porpoises, and whales come in different forms to fit the swimming needs of each species. In the flippers, the bones of each digit have thick cartilage pads. eyes small, broad fan-like ears, huge trunk, thick pillar like legs and small tail. [12], Because of the specialization of flippers and their hydrodynamic constraints, it was thought that they were not used to significantly interact with the environment, unlike the legs of terrestrial tetrapods. On this Wikipedia the language links are at the top of the page across from the article title. They have black dorsal and white ventral surfaces and patches of white color over the black color around the eyes. (flp ) noun. Whales in this suborder include river dolphins, beaked whales, sperm whales, beluga or white whales, narwhal, killer whales, Atlantic bottlenose dolphins and the common or harbor porpoise. no rear limbs, front flippers are used for steering . Hippopotami leave the water at dusk to feed on land vegetation. [4], Flippers on humpback whales (Megaptera novaeangliae) have non-smooth leading edges, yet demonstrate superior fluid dynamics to the characteristically smooth leading edges of artificial wings, turbines and other kinds of blades. (railcoot, plover, crane, herons), homeotherms Emperor Penguins, for example, "nest" where there is just ice, with no exposed rock. flattened, spade-shaped teeth, small whales with a distinctive beak laterally flattened with a paddle like tail mostly ovoviviparous carnivorous . THE OCEAN. 3. cricket. Mammal: Type # 1. dor noun. All cetaceans have forelimbs that have been modified into flippers and no hind limbs. Animals with flippers include penguins (whose flippers are also called wings ), cetaceans (e.g. [9], Sea turtles evolved in the Cretaceous. They are considered critically endangered. Galapagos penguins are the only penguin that lives north of the Equator. Flippers Wings are modified into paddle-like flippers. Dugongs grow up to 10 feet long and weigh 510 to 1,100 pounds. By Oliane and luis. curved dorsal fins Order Family Species (Genus, then specific epithet) Didelphimorphia (Opossum) Didelphidae ST sp. both parents raise a single chick, heavy beak with tube like nostrils float low in the water because their outer feathers lack oils to make it easier for them to dive, agile flyers (narrow wings and long forked tails) The Galapagos penguins flippers are long and narrow. Large rounded tubercles along the leading edge of the flipper are morphological structures that are unique in nature. A beluga whale's pectoral flipper contains five digits much like the fingers on a human . Belugas have a broad, rounded head and a large forehead. They can use their long flippers to steer and the bumpy tubercles help with speed. 3. Animal description The Beluga whale weighs 3,300 ponds and they are15 feet long.They can live up to 30 years old.The beluga whale is gray and white.They have a round head,a flat mouth, and flat teeth .They have broad , paddle-like flippers.The Beluga whale likes to use their mouth to make squeaky noises.The Beluga whale baby's are a medium size.They are called a calf when they are babies. Sea otters are the largest member of weasel family, and the only one that lives almost entirely in the water -- hunting on the ocean floor, and coming to the surface to eat, groom, rest and socialize with other otters. These vibrissae are also found around the mouth. hind flippers only used for swimming- dragged on land They use their large flippers to help steer and navigate the difficult waters of the Amazon river systems. They have long and strong fore-flippers and hind-flippers that are not only limited to swimming but also enable them to walk on the land. most breed and build nests on land (for some it is the only time they come to land) Solution: Whales are large marine mammals well adapted for aquatic life. Their four limbs give them good mobility on land. Flippers are one of the principal control surfaces of cetaceans (whales, dolphins and porpoises) due to their position in front of the center of mass, and their mobility which provides three degrees of freedom. Hind limbs absent in cetaceans and sirenians. Limbs: webbed feet are developed. It lays eggs and has a long, leathery bill equipped with electroreceptors that help detect the magnetic fields of the aquatic invertebrates it feeds upon. omnivores but prefer meat Dugong are in the same family as manatees. Recognized by their broad, rounded head and a large forehead, they have broad paddle-like flippers, notched tails, a five-inch-thick layer of blubber, and a tough dorsal ridge . The beluga can change the shape of its bulbous forehead, called a "melon", by blowing air around its sinuses Beluga whales' dives may last up to 25 minutes.