This black bear was spotted atop a tree in Tampa, Fla., on May 17, 2013. The bear population has been on the rise, so state wildlife officials are calling for a bear hunting season. Skip O'Rourke /MCT /Landov hide caption

itoggle caption Skip O'Rourke /MCT /Landov

The European eagle owl, like this one from the Mulhouse Zoo in eastern France, is one of the largest owl species, with a wingspan of about 6 feet. Sebastien Bozon/AFP/Getty Images hide caption

itoggle caption Sebastien Bozon/AFP/Getty Images

Laurie McCannon, director of the Northeast Animal Shelter in Salem, Mass., with a dog named Trina. Three-quarters of the dogs adopted from the shelter in 2013 were from out of state. Shannon Mullen for NPR hide caption

itoggle caption Shannon Mullen for NPR

A puppy waits at an adoption event in Miami last year. The city is now considering a ban on the sale of puppies in retail pet stores. Cities and towns in several states have passed similar bans, aimed at cracking down on substandard, large-scale puppy breeders. Wilfredo Lee/AP hide caption

itoggle caption Wilfredo Lee/AP

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