These amphipods were discovered by scientists from the University of Aberdeen in waters more than 4 miles deep, north of New Zealand. Similar shrimplike crawlers may lurk at the bottom of the Challenger Deep. Oceanlab/University of Aberdeen/AP hide caption

itoggle caption Oceanlab/University of Aberdeen/AP

Najin, a female northern white rhino, gets a pat from keeper Mohamed Doyo. Najin, who lives at the Ol Pejeta Conservancy in Kenya, is one of only five of its subspecies left in the world. Ben Curtis/AP hide caption

itoggle caption Ben Curtis/AP

This sea otter, about to eat a crab in the Elkhorn Slough National Estuarine Research Reserve, is cute, sure. But more importantly, it's indirectly combating some harmful effects of agricultural runoff and protecting the underwater ecosystem. Rob Eby/AP hide caption

itoggle caption Rob Eby/AP

A horse-drawn carriage operator waits for riders near Central Park in New York on October 20, 2014. Mayor Bill de Blasio is backing legislation that would ban such carriages in 2016. JEWEL SAMAD/AFP/Getty Images hide caption

itoggle caption JEWEL SAMAD/AFP/Getty Images