Animals

It's the second video from Yellowstone in recent weeks.

Were they trying to save energy, or just happy to see you?

Sightings of bald eagles and many other species increased as noise and traffic dropped.

Túngara frogs protect their eggs with a special foam that scientists want to use for future, long-acting topical antibiotics.

Don’t panic—this spiky friend is largely harmless.

The magpie-sized Yuanchuavis probably wasn’t a strong flyer, but it did dress to impress.

The new fossil is one of the most intact specimens of giant penguins we have.

An analysis of puffins and other birds could explain mysterious mass die-offs.

Ammonia is a big problem for pollution and climate change. But teaching a cow to use the 'MooLoo' could change that.

Don't tell us you've never thought about it.