Bats are the only mammals that can fly, and they live much of their lives hanging upside down.

Bats are the only mammal native to the island.

The only other marine mammals that use tools are Sea otters.

Humans, after all, are the only mammals that consume milk past infancy.

Bats are the only mammals that truly fly, rather than just gliding.

The white-footed mouse was the only mammal taken in more than one study area.

Vampire bats are the only mammals that feed exclusively on blood.

Humans are not the only mammals susceptible to breast cancer.

Bats are the only mammals capable of sustaining level flight.