Staffan Widstrand / RF- Jaguar head profle portrait (Panthera onca) head portrait captive. Pantanal, Brazil. (This image may be licensed either as rights managed or royalty free.)
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Danny Green / Polar bear (Ursus maritimus) male in snow. Svalbard, Norway, April.
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Heather Angel / Man using pole to propel bamboo raft on Lijang / Li River, Karst peaks beyond. At dawn, Lijiang River Scenic Zone, Yangshuo county, Guangxi, China.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri), four chicks in moult aged 20-24 weeks, parents away fishing in open water. Atka Bay, Antarctica. January.
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Paul Hobson / Parrot snake (Leptophis ahaetulla) in aggressive pose with mouth open. Costa Rica.
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Paul Hobson / Keel-billed toucan (Ramphastos sulfuratus) perched on branch with beak open. Laguna del Lagarto, Alajuela, Costa Rica.
Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) digging their nests by night with stars during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.