This is the moment Koga the 400lb silverback was knocked out for his annual health MOT where brave vets inspected his heart, eyes, teeth and muscles. Koga, 34, who is a western lowland gorilla, has a health MOT every other year to ensure that his health is in tip-top condition. The images of Koga, who has been at The Buffalo Zoo in New York since 2007, were taken by Christan Dobosiewicz, 30.
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