A new study clarifies the relationship between temperatures and changes in the size of the body parts of animals.

Pinpointing when animals first appeared on Earth is like finding a needle in a very old, planet-sized haystack. A new study narrows the search.

Why did more animal species from Asia make the leap to Australia than vice versa? A new study may have some answers.

"This is really exciting because we are looking for the first time at the molecular blueprints of the ancestor that gave rise to the first eukaryotic cells."

Curly hair may have kept early humans cool while conserving water at the same time, according to new research.

A new hypothesis 'raises the possibility that romantic love in humans finds its origin in same-sex friendships of apes."

The erosion of layers of rock by rivers in the Appalachian Mountains generates biodiversity of freshwater fish species, a study suggests.

To shed light on where, when, and how humans originated in Africa, researchers took a new approach using contemporary genomic evidence.

Early life adversity doesn't appear to affect gorilla health and lifespan later on in the same way it affects humans, researchers report.

Scientists have discovered where the first butterflies originated and which plants they relied on for food.