Biologists have long debated why some plants and animals can adjust to a wide range of climates, while others can't.

The breeding range for the Bohemian waxwing (purple) extends over a large swath of the Arctic, while the chestnut-crowned laughingthrush (red) inhabits a much smaller arc in Asia centered on Nepal and ...

WWF works to sustain the natural world for the benefit of people and wildlife, collaborating with partners from local to ...