When North and South America joined millions of years ago, mammals from the north fared better in the meetup. Extinctions in the south may be why.

When the Isthmus of Panama connected North and South America, two independent dynasties of horses, rhinos, elephants, shrews, weasels, cats and dogs were free to mingle, fight, dominate or die.

South America is filled with mammals from North America, but why more didn’t survive the reverse trip has been a natural history mystery. Share full article 12 ...

Bee and butterfly records indicate diversity losses in western and southern North America, but extensive knowledge gaps remain. PLOS ONE, 2024; 19 (5): e0289742 DOI: 10.1371/journal.pone.0289742; ...

Travel in and out of the densely populated region of Southern California can be hectic — but that didn’t stop one of its busiest airports from being named top in North America. According to ...