Biology

Sex is not one single, simple, uniform biological reality, so biology cannot be invoked as a basis for “immutable” legal classifications

Humans have a surprising lack of hair for mammals. Biological anthropology may provide insights into why the hair we have sometimes comes out curly.

A rare and deliberate signal between a mother chimpanzee and her daughter raises new questions about ape communication, culture and the meaning of sharing a language

White-throated Sparrows demonstrate that traits we usually associate with sex can be influenced by genes that are not on sex chromosomes

The Internet’s vast cat resources help researchers chart cat eye evolution

Sea turtles are capable of creating GPS-like magnetic maps to guide them back to foraging grounds, and they do a little dance when they recognize those spots

In many cultures, men are not involved with hands-on childcare. But biology tells us we are perfectly capable of doing so

Humpback whales learn their haunting melodies in much the same way humans learn words

Could tiny swimming microbes help us unlock the mysteries of extraterrestrial life?

These caterpillars carry a toxic chemical cocktail and Inquisition-like delivery implements—and their geographic range is expanding

Tiny frogs seem to skim the water’s surface, but high-speed video reveals their secret

In honor of the Year of the Snake, let’s appreciate the strange anatomy and evolution of these slithery reptiles