Phil Savoie / Red eyed tree frog on heliconia (Agalychnis callidryas)

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) male looking down from branch. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female in tree. Sahamalaza, Madagascar.

Patricio Robles Gil / Kashir grey langur (Semnopithecus ajax) Dachigam National Park, Jammu & Kashmir, India.

Piotr Naskrecki / Hairy Big-eyed Bat (Chiroderma villosum) flying, Costa Rica

Piotr Naskrecki / Red-eyed Tree Frog (Agalychnis callidryas), Belize

David Fleetham / White-eyed moray eel (Muraena thyrsoides) close to Zebra lionfish (Dendrochirus zebra), Philippines.

David Fleetham / Pair of White-eyed moray eels (Muraena thyrsoides) share the hole of a mooring block off Bali, Indonesia.

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ingo Arndt / Red-eyed tree frog (Agalychnis callidryas) eye closed with semi-transparent eyelid that allows it to see its surroundings even while resting, Costa Rica.

Ingo Arndt / Red-eyed Tree Frog (Agalychnis callidryas) close- up of eye half open, the golden webbed semi-transparent eyelid allows to see its surrounding even while resting, Costa Rica.