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Transcript of Marine Mammals
Two major groups of marine mammals are:
There are approximately 125 marine mammal species worldwide managed under the MMPA.
Wait! What is a mammal, really?
To Be a Mammal...
Endothermic (warmblooded) animals
Have a body mostly covered with hairs...
In marine mammals, hair is only seen in young cetaceans and as baleen in whales
Produce milk through mammary glands
Give live birth to offspring
Side Note: There are no egg-laying exceptions in the ocean, but on land Austrailia holds 2 types of mammals that lay eggs. Do you know what they are?
There are at least 19 species of dolphin in existence
Found in temperate and tropical waters around the world
Most Common Species: Bottlenose Dolphin
squid, crab, fish
called pods or herds of 2-15
Orcas are the most widely distributed marine mammals, found in all parts of the oceans
up to 50-100 years
varies (diet is often geographic or population specific), can include fish, marine mammals, sharks, and sea birds
There are at least
10 known ecotypes
3 main species- Smallest, fastest cetaceans
entire North Pacific
about 15-20 years
anchovies, herring, squid, octopus, crab
Porpoise looks like a small dolphin without a beak
At least 29 known species in existence
Blue whales are found worldwide, from sub-polar to sub-tropical latitudes
unknown, but sexually mature around 5-15 years
Blue whales can grow up to
Killer whale comes from a misconstrued term: whale killer because orca have been seen killing large whales!
Dolphin exhibit incredibly high levels of intelligence similar to humans- many studies are currently being conducted on this topic
Ability to learn and adapt to new situations
Varied hunting patterns with new ones emerging
Echolocation / SONAR
Pinnipeds are a
of carnivores with limbs (not fins) adapted to an aquatic life
There are over 18 species of "true seals"
or earless seals
Unlike whales and dolphins, pinnipeds share their time between the water and the land (or ice)
Descended from either bear-like or otter-like creatures
about 25-30 years
mainly fish, shellfish, and crustaceans
Habitat: varies by species
Sea Lions and Fured Seals
squid, anchovies, mackerel, rockfish, and sardines
California Sea Lion-
These species are the "eared seals" that have pinnae or outer ear flaps
Varied. Mostly in the Pacific along the west coast of the Americas, as well as in Austrailia and the Arctic circle.
Up to 40 years
Walrus staples include clams, mussels and other bottom dwelling organisms
Artic regions only
Much larger other pinnipeds, with thick whiskers on lips and large tusks
Only one species
Other Marine Mammals...
about 30 years
mostly ringed and bearded seals, but have been known to hunt walruses and whales!
Artic regions only
Largest bear species- Ursus maritimus
Polar bears are extremely fast runners and swimmers
Lobster, sea urchin, abalone
Sea otters live in the North Pacific (Japan to Alaska)
Most aquatic of its relatives, does not haul out on ice much.
Dugongs and Manatees are in the same order as elephants!
Large brownish to gray animals from the Western Pacific and Indian Oceans.
3 species that live about 60-70 years. Highly protected species that eat vegetation (plants)
Pinniped comes from Latin:
meaning "wing or fin footed"
*Considered marine because they completely submerge when diving