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The red-eyed tree frog (Agalychnis callidryas) having a nap in the trees of a tropical rainforest. Photo by Heidi and Hans-Jürgen Koch. In the day, when the frog is asleep, a gold membrane creeps over its eyes. It lets in a small amount of light, enough so that if a predator approaches, the non-poisonous frog can wake up, show its bulging red eyes and present its yellow feet in a bid to make the would-be attacker think twice. Photo by Heidi and Hans-Jürgen Koch.

The Eye of a Tree Frog. The film covering his eye is a nictating membrane that’s effectively an extension of its lower eyelid. It keeps his eye moist while he’s asleep. Because it lets in light, the frog can still detect predators while asleep.

Imbalance by Heidi Westum on 500px Heidi Westum's gallery http://500px.com/Heiwe

Imbalance by Heidi Westum