Can all terrestrial mammals swim?
In order for a terrestrial mammal to swim, it must be able to make coordinated motions that prevent the animal from sinking and allow it to move forwards.
Almost all four-legged mammals – from elephants, camels, and rhinos to small rodents – can make functional swimming motions, by which legs and feet work as paddles. Four-legged terrestrial mammals can easily learn to make the right swimming motions, as they are reminiscent of their running and walking motions. Among two-legged terrestrial mammals, the ability to swim has been observed in bats, kangaroos, etc. However, some apes have more difficulties swimming, maybe because their arms are longer than their legs, requiring more coordination.