Other mammals use several genes on the Y-chromosome for that same purpose.

Even mammals such as raccoons may use them.

Kangaroo rats and other small mammals use evaporative cooling in a similar way.

Many birds and small mammals use it for food and cover.

As any nature show will demonstrate, mammals use several methods for marking their territory.

There are two mechanisms mammals can use to regulate responses to seasonal change.

Reptiles, birds and mammals use more of the musculoskeletal system.

Female mammals (and women) use nipples for breastfeeding.

First, the small mammals and birds use the forest ground floor and underground.

This is similar to the method mammals use to determine direction of sound.