For an alligator, in both love and war, it’s good to be big . An alligator’s bellow communicates just how big it is.

You'd expect sunglint from an ocean or other body of water. But the camera caught some glints over land as well. A new NASA video explains how scientists solved the mystery.

Fossils found in Australia - in ancient hot spring deposits - have pushed back the earliest known evidence for land-based microbial life to 3.48 billion years.

At the end of April, just 6% of the United States was afflicted by drought. That’s a substantial turnaround from a few years ago.

Noctilucent clouds - aka night-shining clouds - can be seen at high latitudes in summer, typically beginning for northern latitudes in late May. French photographer Adrien Mauduit in Denmark assembled his best 2016 photos into a wondrous video.

In 1898, a pair of lions ate 135 people at a railroad camp in Kenya. Scientists have analyzed microscopic wear on the lions' teeth to find out why.

New from NASA, a short video tour of unusual and beautiful clouds observed from space.

Up to 1 billion birds die each year in the U.S. due to collisions with windows. Why do birds slam into windows, and what can you do to prevent it?

Twitter has been blowing up with posts on cats' attraction to taped squares on the ground. An animal behavior expert explains what draws Fluffy to the #CatSquare.

Antarctica has 12 million penguins and 5 penguin species, according to a new report released today. But at least 2 penguin species have recently and significantly declined.