Knobbed Hornbill, also known as Sulawesi Wrinkled Hornbill. The male is central in the photograph and a small portion of the female's head is to the left. Photographed at San Diego Zoo, California, USA.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/25894944@N07">Jerry Thompson</a>
CC BY 2.0
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