BECAUSE THEY WERE BORN LIKE THAT !
lmfaooo. no I'm kidding.. i don't know how. I'm not a genius here..
but their gills let them that's one (:
Note: No mammal has gills after birth. They have an enhanced lung capacity, like whales, seals, polar bears, etc, that lets them hold their breath longer than other mammals can. They also tend to have a lot of blubber and protective fur, that allows them to survive the frigid temperatures of most aquatic habitats.
Those animals that live in the water 24/7-- meaning that they never venture onto land, the way otters, beavers, etc, can-- are only able to sleep by 'turning off' portions of their brain at a time. A part of them rests, another part remains active and awake so that they don't sink below the surface and drown.
No, humans are mammals...
because they cannot live out of the water and yes they are mammals!!
Plainly and simply, no... other than whales.
land mammals live on land, sea mammals live in the water.
Aquatic mammals are mammals that can swim and live in water if necessary.
whales
no
Yes, mammals like Manatee, dugong, whales and dolphins all live in salt water.
No. Platypuses can only live in cool temperate to tropical climates, and alongside fresh water sources such as creeks and rivers. There are no creeks or rivers in Antarctica as it is a frozen continent. The only mammals that live anywhere near the Antarctic are marine mammals such as whales.
fish, aquatic mammals, aquatic bugs, ect. i think that is the answer to your question but im not sure.
They generally call animals that live only in water fish, but there is certain categories that they can go under. For instance, some fish are actually mammals.
No. Water buffalo are placental mammals, so they give birth to live young. The only egg-laying mammals, or monotremes, are the platypus and the echidna.