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Marine Iguana
Photograph by Gina Martin, National Geographic
Scales help protect this lizard from harsh weather and predators. The marine iguana (Amblyrhynchus cristatus) is unique to the Galápagos Islands. Despite its scaly shield, the species is still considered vulnerable to extinction because of non-native rats, feral cats, and dogs that feed on iguana eggs and young.
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Victoria Crowned Pigeon Feathers
Photograph by Tim Laman, National Geographic
The crest of a Victoria crowned pigeon (Goura victoria) creates a bouquet of gray and white. Found in tropical regions and related to the Dodo (Raphus cucullatus), the Victoria crowned pigeon features a crest fringed in white. The males display their feathery headdresses to attract a mate.
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Parrotfish Scales
Photograph by Tim Laman, National Geographic
The crest of a Victoria crowned pigeon (Goura victoria) creates a bouquet of gray and white. Found in tropical regions and related to the Dodo (Raphus cucullatus), the Victoria crowned pigeon features a crest fringed in white. The males display their feathery headdresses to attract a mate.
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Wandering Albatross Wings
Photograph by John Eastcott and Yva Momatiuk, National Geoggraphic
A wandering albatross (Diomedea exulans) contracts its wings during a mating ritual on South Georgia Island, Antarctica. This arduous traveler has one of the greatest known wingspans of any bird, measuring up to 11.5 feet (3.5 meters), and has been recorded flying 500 miles (805 kilometers) in a single day.
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Lake Baikal Fish
Photograph by Bill Curtsinger, National Geographic
Orange spots mark the fin of fish photographed in Lake Baikal, Siberia, Russia.
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Argus Pheasant Feathers
Photograph by Tim Laman, National Geographic
Found in Southeast Asia, the male great argus pheasant (Argusianus argus) displays these dots on its feathers during courtship. Its plumage radiates around its head, like a peacock's. Beyond attracting a mate, feathers are used for insulation, flight, and, in some cases, to help a bird hunt and evade predators.
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Wedge-Tailed Eagle
Photograph by Jason Edwards, National Geographic
The feathers of a wedge-tailed eagle (Aquila audax) form a gauzy screen in Alice Springs Desert Park in Australia's Northern Territory. From a central feather vane sprout hundreds of filaments called barbs. The barbs in turn sprout other, smaller filaments, some with grooves and some with hooks that clasp the barbs together like Velcro, allowing the bird to fly.
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Black-Chinned Sparrow Feathers
Photograph by Tom Murphy, National Geographic
A fan of black-chinned sparrow (Spizella atrogularis) feathers captures the light. When birds pull their feathers apart to clean them, the barb filaments simply zip back together by themselves.
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