When deforestation and climate change destroy swaths of habitat, some people assume that birds will be OK because, unlike mammals, they can fly to new locations.

However a 2012 study of two closely related scythebills discovered that the displaced birds don’t survive, even in habitat like the ones they left, because they’re out-competed by the locals.

On Throw Back Thursday, find out why these birds can’t survive near their relatives in this vintage blog: Why Don’t They Just Move?

(photos from Wikimedia Commons; click on the caption links to see the originals)