A wormlike creature that lived more than 555 million years ago is the earliest bilaterian

Domestication yielded bigger crops often at the expense of plant microbiomes

Bipedalism may have been favored in kangaroo rats to avoid ambush predators like vipers and owls, says UC Riverside biologist

UC Riverside research focused on interaction between nitrogen-fixing bacteria and their hosts

Females love males with big dorsal fins, but the appendages first evolved for males to fight other males