Rolf Nussbaumer / RF- Green treefrog (Hyla cinerea) on yellow waterlily. Welder Wildlife Refuge, Sinton, Texas, USA. (This image may be licensed either as rights managed or royalty free.)
01133170
Kim Taylor / Tokay gecko {Gecko gecko} eye showing pupil partially closed. Captive occurs Asia.
01109661
Michael Durham / Blue and Yellow macaw portrait eye closed {Ara ararauna} captive - occurrs Central-America and South-America
01614247
Doug Gimesy / Closed eye and top of bill of a platypus (Ornithorhynchus anatinus) Photographed under controlled conditions - platypus anaesthetised in-field as part of research. Darmouth, Victoria, Australia. May 2...
01614240
Doug Gimesy / Closed eye and top of bill of a Platypus (Ornithorhynchus anatinus). Darmouth, Victoria, Australia. May.
Eric Baccega / Common hippopotamus (Hippopotamus amphibius), close up of eye. Skin spotted with secretion of blood sweat, a red substance that acts as natural sunscreen. Beauval Zoo Parc, France. Captive.
01629630
Eric Baccega / Common hippopotamus (Hippopotamus amphibius) portrait, underwater. Beauval Zoo Parc, France. Captive.
01620377
Eric Baccega / Mountain gorilla silverback (Gorilla beringei) lying down, member of the Nyakagezi group, Mgahinga National Park, Uganda, January.
01614959
Sven Zacek / Ural owl (Strix uralensis) female interacting with chick on nest. Southern Estonia. May.
01602643
Tony Heald / Southern elephant seal (Mirounga leonina), male flicking sand over body on beach. Right Whale Bay, South Georgia. September.
