These articles explore evolution - the changes seen in the inherited traits of a population from one generation to the next. Evolution is one of the great mysteries of biology, since it is a slow process and difficult to study.

Surprisingly Swift Evolution Observed in Lizard Species

Over the course of one frigid winter, green anole lizards in Texas changed up their genetic makeup to help them better tolerate cold.

Artifacts Suggest Human Arrival in Australia 18,000 Years Earlier Than Thought

Researchers have deduced that Homo sapiens reached Australia 65,000 years ago, extending our presence Down Under by 10,000 years.

Dinosaur Extinction Allowed Frogs to Flourish

Frogs owe a debt to that giant asteroid, a new study finds, opening up evolutionary options previously blocked by dinos.

Family Tree of Homo Sapiens Continues to Evolve

Were hobbits and giants real? And are they distant relatives of humans?

Oldest Homo Sapiens Fossils Ever Found Suggest a Human Evolution Rewrite

Remains in Morocco push back Homo sapiens origins at least 100,000 years — and show that our species evolved neither in the way nor place we've assumed.

New Analysis Places 'Hobbit' on Unexpected Limb of the Human Family Tree

Homo floresiensis, popularly known as a hobbit, is an extinct, miniature human species that might be much, much older than previously thought.

Ancient Skeleton DNA Suggests Genetic Link to First Humans in North America

Do ancient human remains mean we've found an ancient ancestor? It's not always that simple.

Climate Helped Shape the Human Nose, Study Says

Temperature and humidity might have determined nostril width.

Seeing Food May Have Lured Fish Onto Land

The ability to see food on land might explain why our fish ancestors evolved, eventually growing limbs so they could stalk the abundance of prey on land.

Is It Time for Our Understanding of Evolution to Evolve?

A group of researchers is pressing to rethink Modern Synthesis, a version of evolutionary theory we've used since the 1940s to explain how species change and adapt.