Philippe Clement / European jackdaw (Corvus monedula) mirror image composite of two birds in different threat postures, on the left - the forward-threat posture, with the bird holding its body horizontally and thrusting...
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Nick Turner / Bromeliad in flower {Aechmea magdalenae} Corcovado NP, Costa Rica
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Sumio Harada / Mountain Goat (Oreamnos americanus) pair fighting for salt rights, male at left threatens female at right who lowers her rump in defense, Walton Goat Lick, Glacier National Park, Montana
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Joel Sartore / Photo Ark / Siberian crane (Leucogeranus leucogeranus) female looking around, then the animal lowers its head and ruffles its feathers. International Crane Foundation, Baraboo, Wisconsin. Controlled condiitons. C...