The earliest whales had hips attached to the spine, just like any terrestrial mammal.

Bats follow the trend, undoubtedly starting from terrestrial mammal ancestors.

Because they need larger amounts of land than other sympatric terrestrial mammals, they are the first to be affected by human encroachment.

These fleas usually parasitize terrestrial mammals, and in a few cases birds and bats.

Their whiskers or vibrissae have ten times the innervation of terrestrial mammals, allowing them to effectively detect vibrations in the water.