Earth Matters

Opportunity's last photo is a bittersweet travel log of Mars

Robots hunt starfish, lionfish to save coral reefs

5 slimy facts that will change how you look at banana slugs forever

A huge lake just appeared in Death Valley

Italy's newfound coral reef is a special breed

March can be beautiful, but why is the weather so weird?

11 charismatic animals with political ambitions

Meet the millipede that uses cyanide as self-defense

Cells from a 28,000-year-old woolly mammoth have been 'revived'

Painted lady butterflies fill the skies over southern California

A fight between leopards comes to an end when they fall into a 50-foot well

Ontario drivers take a detour for salamanders