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National Zoo and Conservation Biology Institute

A 41-day-old Guam kingfisher chick at the Smithsonian's National Zoo and Conservation Biology Institute. With fewer than 140 Guam kingfishers left in the world, all living in human care, every chick is precious.

Growing Up Guam Kingfisher

Tigers are the largest cat species in the world. Amur tigers (sometimes called Siberian tigers) are the biggest tigers, with males weighing up to 660 pounds and measuring up to 10 feet long from nose to tip of the tail.

What Does Tiger Poop Look Like? And More Tiger Facts

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