The Earliest Mammals Kept Their Cool With Descended Testicles
But if free-swinging sperm sacs are the norm, then why did undescended ones evolve four separate times?
A Primer on the Zoo’s Possibly Pregnant Giant Panda
In anticipation of a potential new cub, here’s a refresher on Mei Xiang and Tian Tian’s storied past
Australian Feral Cats Eat More Than a Million Reptiles Per Day
A new study shows cats snack on 258 reptile species, and could push some to the brink of extinction
It’s Pooches vs. Poachers in the Fight Against Wildlife Smugglers
A new breed of law enforcement is on the scene—and its bite is stronger than its bark
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