UC Berkeley researchers have found fossil evidence that animals from different latitudes of North America and South America mixed long before the Panamanian land bridge permanently linked the two ...

North America’s most dangerous animals are rarely its largest. Venom does the work instead, delivered by snakes coiled in leaf litter, lizards buried under desert scrub, and spiders folded into the ...

When people think about deadly animals, their minds usually go straight to teeth and claws. But throughout North America, fatal encounters often stem from reasons that go beyond the usual teeth and ...

In 1782, a lesser-known Founding Father, Charles Thomson, slapped a shield onto a bald eagle with talons full of arrows and olive branches and called it the Great Seal of the United States. Benjamin ...

Until the Panamanian isthmus formed about 2.8 million years ago, North and South America were isolated continents with unique groups of animals. A riot of marsupials—mammals with brood pouches—and ...

Museum specimens reveal North America’s largest crayfish and suggest most giant species reach a similar upper body size.