A curious cuttlefish stares back at the camera from inside The Smithsonian's National Zoo Invertebrate Exhibit. The exhibit, home to dozens of small aquatic and terrestrial species without backbones, closed on Sunday. Meghan Murphy/Smithsonian's National Zoo hide caption

itoggle caption Meghan Murphy/Smithsonian's National Zoo

The fossilized remains of a whale that washed up on a shore in what's now Chile more than 5 million years ago. Vince Rossi/Smithsonian Institution hide caption

itoggle caption Vince Rossi/Smithsonian Institution

A fish that knows the way to go: the Chinook salmon, which appears to use the Earth's magnetic field to navigate ocean waters and rivers. Jeff T. Green/Getty Images hide caption

itoggle caption Jeff T. Green/Getty Images

Caught red-beaked: This eagle grabbed a small wildlife camera in western Australia, flew away with it and then pecked away at the lens. ABC Kimberley hide caption

itoggle caption ABC Kimberley