Scientists have documented same-sex behavior in many animals. Learn what it means, how it varies, and why human labels can mislead.

The results of inbreeding can be very distressing to witness. In this Instagram post, we see a captive lion with skull deformities, and in this post, we see another lion with drastically shortened ...

A new study sheds light on the illuminating, sometimes counterintuitive dynamics of mating and how species survive.

Different species often form due to geographic barriers such as mountain ranges or rivers, which separate populations of the same species until they have become so different that they can no longer ...