Sloths Are So Slow That Algae Often Grows on Their Fur

With thousands of species, some stick insects rock back and forth as if moved by the wind.

These flatfish adjust their pattern and color within moments, and can blend in on sand and gravel.

Madagascar's Uroplatus geckos have flattened bodies and ragged edges that make them nearly invisible against bark and leaf litter.

Their fur turns white in winter and brown in summer, matching the landscape in each season.