The unicellular species Stentor roeseli performs a form of sequential decision-making to avoid irritating stimuli.

The tamed foxes, whose appearances changed with breeding, weren’t wild to begin with, say the authors of a new study.

Researchers’ simulations suggest that small population sizes and inbreeding made Neanderthal populations vulnerable to chance fluctuations in population size.

Scarab beetle horns share a common genetic origin with wings.

Researchers analyzed more than 800 species.

This marine animal looks like a sea star, but don’t be fooled.

Plants, fungi, and bacteria likely contributed to insect diversity.

An analysis suggests that DNA cribbed from soil microbes enabled plants’ ancestors to colonize a terrestrial environment.

This ancient bird has a modern tail bone.