DNA preserved in ancient scat reveals what Yukon ground squirrels ate and what animals shared their world.

During courtship, male scissor-tailed nightjars crack their wings together to make a sharp snapping sound. It's the result of colliding arm bones.

A new analysis of a 120-million-year-old fossil suggests at least one pterosaur species shimmered in iridescent greens and magentas.

In a clinical trial, an experimental antibody reduced lean-mass loss in people on a GLP-1 drug. Whether that improves health is unclear.

The result is correct but challenges core norms of mathematics: checking proofs, crediting ideas and keeping research open to everyone.

Over more than a decade at Mars, the orbiter revealed how the solar wind strips away the planet’s atmosphere — and why the world lost its water.

A shrimp vaccine for commercial use could protect the environment and prove vaccines aren’t just for vertebrates.

The deep-sea octopus is fully mature despite fitting in a palm, a trait researchers think may help it reproduce faster than larger relatives.