An analysis of fossils from the country hints that animals from the north stayed in a "holding pen" between seven million and ten million years ago. The timeline might help explain why so many South American mammals have North American ancestry,

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 sloths in the south contrasted with camels,

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It seems as if the world is afire this summer. But even as wildfires in Europe and North America grow more extreme, key worldwide burning

Watch your backyard come to life as amazing owl species swoop through the night skies. Get to know the types of owls you might see.