Olive Ridley turtles come ashore to lay their eggs on La Escobilla beach in Oaxaca, Mexico, one of the most important nesting grounds in the world for the creatures. Before the Mexican government instituted a ban on their slaughter, Olive Ridley turtles were harvested nearly to extinction. Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR

Hope (front) and Striker were brought to the Animal League in Richmond, Va., because their owner faced a home foreclosure. P. Kevin Morley/Richmond Times-Dispatch/AP hide caption

itoggle caption P. Kevin Morley/Richmond Times-Dispatch/AP

Boma's antelope migration is believed to be second in size only to the wildebeests of the Serengeti. Here, a group of Eland antelope. Miguel Juarez for NPR hide caption

itoggle caption Miguel Juarez for NPR