Sexual selection can take place after mating, not just before, research on C. elegans worm sperm finds.

City environments are changing the way plants evolve, a new study of white clover, one of the few organisms present in almost every city on Earth, shows.

The earliest relative of octopuses and vampire squid lived 328 million years ago, had 10 arms, and suckers to grasp prey. It's named after Joe Biden.

One of the fundamental questions in biology, and a centuries-old academic debate, is: How do new species form? Birds in New Guinea offer answers.

How did eyespots on butterfly wings evolve? By recruiting gene networks already at work in the body to build antennae, legs, and even wings, research finds.

Experiments with chimpanzees trying to figure out how to crack open nuts on their own suggest they may learn cultural behaviors from others like humans do.

New research that indicates humans may have arrived in Europe much earlier than previously thought also raises some intriguing questions.

A new study suggests that, like modern birds, some dinosaurs brightly colored skin or scales and used the color to find a mate.

A taste receptor sensitive to acidity in fruit flies is in the same group as human sour receptors, research finds.

A new kind of new saber-toothed predator was hiding in plain sight: at the Smithsonian National Museum of Natural History.