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13 of the cutest tree-dwelling animals in the world

By: Bryan Nelson on June 3, 2013, 5:34 p.m.
A green gecko crawling on a tree trunk

Photo: Natali Glado/Shutterstock

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Gecko

Usually it takes a reptile-lover to appreciate the cuteness of a lizard, but geckos might be the universal exception. Who wouldn't be enamored with that sly little smile?

Of course, it helps that many species of gecko are insectivorous, a diet that includes mosquitoes. So wherever they're plentiful, geckos are rarely considered pests; they're a welcome sight in many tropical households.

But the trait that geckos might be best known for is their incredible Spider-Man-like climbing ability, which is due to the adhesive qualities of their toes. How they manage their gravity-defying feats remained a mystery to science until relatively recently, when it was discovered that they take advantage of weak molecular attractive forces.