Ornithologist Daria Koshcheyeva holds Great Gray Owls during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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Mykh, a Great Gray Owl, sits on the head of zoo keeper Daria Cherepanova during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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Ornithologist Daria Koshcheyeva holds Zheltiy (Yellow), a Great Gray Owl, during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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Ornithologist Daria Koshcheyeva releases Zheltiy (Yellow), a Great Gray Owl, during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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Mykh, a Great Gray Owl, sits on the hand of zoo keeper Daria Cherepanova during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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Ornithologist Daria Koshcheyeva caresses Zheltiy (Yellow), a Great Gray Owl, during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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A Great Gray Owl sits on a snow during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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A Great Gray Owl sits on a snow during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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Zheltiy (Yellow), a Great Gray Owl, sits on the hand of a zoo keeper during a training session at the Royev Ruchey Zoo in Krasnoyarsk, Russia.

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