Marine mammal

marine mammalssea mammalssea mammalmarinemammalslife at seaAquatic mammalaquatic mammalsmarine animalssea
Marine mammals are aquatic mammals that rely on the ocean and other marine ecosystems for their existence.wikipedia
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Aquatic mammal

aquatic mammalsaquaticaquatic or sea mammals
Marine mammals are aquatic mammals that rely on the ocean and other marine ecosystems for their existence.
They include the various marine mammals who dwell in oceans, as well as various freshwater species, such as the European otter.

Pinniped

sealsealsPinnipedia
They include animals such as seals, whales, manatees, sea otters and polar bears.
Pinnipeds, commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic marine mammals.

Sea otter

sea ottersEnhydrasouthern sea otter
They include animals such as seals, whales, manatees, sea otters and polar bears.
The sea otter (Enhydra lutris) is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean.

Whale

whalesflukeflukes
They include animals such as seals, whales, manatees, sea otters and polar bears.
Whales are a widely distributed and diverse group of fully aquatic placental marine mammals.

Polar bear

polar bearsUrsus maritimuspolar
They include animals such as seals, whales, manatees, sea otters and polar bears.
Because of their dependence on the sea ice, polar bears are classified as marine mammals.

Dugong

dugongsDugonginaeDugong dugon
The dugong (Dugong dugon) is a medium-sized marine mammal.

Manatee

TrichechidaeTrichechusmanatees
Manatees (family Trichechidae, genus Trichechus) are large, fully aquatic, mostly herbivorous marine mammals sometimes known as sea cows. There are three accepted living species of Trichechidae, representing three of the four living species in the order Sirenia: the Amazonian manatee (Trichechus inunguis), the West Indian manatee (Trichechus manatus), and the West African manatee (Trichechus senegalensis).

Walrus

OdobenuswalrusesOdobenus rosmarus
The walrus (Odobenus rosmarus) is a large flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere.

Eared seal

Otariidaeotariidseared seals
The lineages of Otariidae (eared seals) and Odobenidae (walrus) split almost 28 mya.
An eared seal or otariid or otary is any member of the marine mammal family Otariidae, one of three groupings of pinnipeds.

Beluga whale

belugabeluga whalesbelugas
Because Charlotte is over 150 mi from the nearest ocean, early naturalists were at a loss to explain the presence of the bones of a marine mammal buried beneath the fields of rural Vermont.

Gray whale

grey whalegrayEschrichtius robustus
After commercial hunting ended, some species, such as the gray whale and northern elephant seal, have rebounded in numbers; conversely, other species, such as the North Atlantic right whale, are critically endangered.
The whale watching industry provides ecotourists and marine mammal enthusiasts the opportunity to see groups of gray whales as they migrate.

Sea mink

N. macrodonNeovison macrodon
Commercial hunting led to the extinction of Steller's sea cow, sea mink, Japanese sea lion and the Caribbean monk seal.
The sea mink was a marine mammal that lived around the rocky coasts of New England and the southernmost Maritime Provinces until it was hunted to extinction in the late 19th or early 20th century.

Sirenia

sireniansea cowsirenians
They include animals such as seals, whales, manatees, sea otters and polar bears.
Sirenians, unlike other marine mammals such as cetaceans, lived in the New World.

Baleen whale

Mysticetibaleen whalesmysticete
In contrast, baleen whales have evolved baleen plates to filter feed plankton and small fish from the water.
They are a widely distributed and diverse parvorder of carnivorous marine mammals.

Even-toed ungulate

artiodactyleven-toed ungulatesCetartiodactyla
Modern cetaceans are highly adapted sea creatures which, morphologically, have little in common with land mammals; they are similar to other marine mammals, such as seals and sea cows, due to convergent evolution.

Animal locomotion

locomotionlocomotor activitylocomotor
Marine mammals have developed a number of features for efficient locomotion such as torpedo-shaped bodies to reduce drag; modified limbs for propulsion and steering; tail flukes and dorsal fins for propulsion and balance.
Marine mammals oscillate their body in an up-and-down (dorso-ventral) direction.

Killer whale

orcakiller whalesorcas
Killer whales and bottlenose dolphins have also been known to drive their prey onto a beach to feed on it.
Some feed exclusively on fish, while others hunt marine mammals such as seals and other species of dolphin.

Tool use by sea otters

sea ottertool useuse a tool
This pouch also holds a rock that is used to break open shellfish and clams, an example of tool use.
Sea otters are the smallest of the marine mammals, but they are also the most dexterous.

Blubber

whale blubberfatinsulating body fat
Marine mammals are adept at thermoregulation using dense fur or blubber, circulatory adjustments (counter-current heat exchange); and torpedo-shaped bodies, reduced appendages, and large size to prevent heat loss.
It is strongly attached to the musculature and skeleton by highly organized, fan-shaped networks of tendons and ligaments, can comprise up to 50% of the body mass of some marine mammals during some points in their lives, and can range from 2 in thick in dolphins and smaller whales, to more than 12 in thick in some bigger whales, such as right and bowhead whales.

Plankton

planktonicnanoplanktonmicroplankton
In contrast, baleen whales have evolved baleen plates to filter feed plankton and small fish from the water.
This is in contrast to nekton organisms, such as fish, squid and marine mammals, which can swim against the ambient flow and control their position in the environment.

Bait ball

lunge feedlunge feeding
One common feeding method is herding, where a pod squeezes a school of fish into a small volume, known as a bait ball.
This leaves them vulnerable to attack by large predatory fish, as well as other predators, such as marine mammals and seabirds.

Great white shark

great white sharksCarcharodon carchariaswhite shark
Killer whales have been known to have paralyzed great white sharks and other sharks and rays by flipping it upside down.
The great white shark is arguably the world's largest known extant macropredatory fish, and is one of the primary predators of marine mammals.

Caniformia

caniformcaniformsCanoidea
Pinnipedia (seals, sea lions, and walruses clade) is a widely distributed and diverse group of semiaquatic marine mammals which is closely related to an extinct group of pinnipeds, Enaliarctos.

Blue whale

blueblue whalesBalaenoptera musculus
Today, populations of species that were historically hunted, such as blue whales (Balaenoptera musculus) and the North Pacific right whale (Eubalaena japonica), are much lower than their pre-whaling levels.
The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whale parvorder, Mysticeti.

Steller's sea cow

Hydrodamalis gigasSteller sea cow(Steller's) sea cow
Commercial hunting led to the extinction of Steller's sea cow, sea mink, Japanese sea lion and the Caribbean monk seal.
They may have hunted the sea cows into extinction, as the natives have a dietary culture heavily dependent upon marine mammals.