Among the Smithsonian National Zoo's 2,000 animals are nearly 400 different species, many of which are critically endangered. Join the Zoo's experts for an inside look at some of its most rare and extraordinary creatures, such as the minuscule and nearly extinct Panamanian golden frog.

Among the Smithsonian National Zoo's 2,000 animals are nearly 400 different species, many of which are critically endangered. Join the Zoo's experts for an inside look at some of its most rare and extraordinary creatures, including the illusive European glass lizard.

Among the Smithsonian National Zoo's 2,000 animals are nearly 400 different species, many of which are critically endangered. Join the Zoo's experts for an inside look at some of its most rare and extraordinary creatures, like the remarkably terrestrial Cuban crocodile.

Among the Smithsonian National Zoo's 2,000 animals are nearly 400 different species, many of which are critically endangered. Join the Zoo's experts for an inside look at some of its most rare and extraordinary creatures, including the often-camouflaged and nocturnal giant leaf-tailed gecko.

Among the Smithsonian National Zoo's 2,000 animals are nearly 400 different species, many of which are critically endangered. Join the Zoo's experts for an inside look at some of its most rare and extraordinary creatures, such as the compact spider tortoise.

Among the Smithsonian National Zoo's 2,000 animals are nearly 400 different species, many of which are critically endangered. Join the Zoo's experts for an inside look at some of its most rare and extraordinary creatures, like the color-changing veiled chameleon.