An impala strikes a pose under a forest canopy in Zimbabwe. Morkel Erasmus/Getty Images/Gallo Images hide caption

itoggle caption Morkel Erasmus/Getty Images/Gallo Images

Yellowtail jack (Seriola lalandi) at HSWRI in San Diego. Courtesy of HSWRI hide caption

itoggle caption Courtesy of HSWRI

Copenhagen, Denmark - October 11, 2014: fruits and vegetables stalls at market in Copenhagen. Customers are choosing goods for themselves. These stalls is located between market halls where one can find over 60 stands with everything from fresh fish and meat, as well as small places to get a quick bite. It is located near Nørreport metro station. iStockphoto hide caption

itoggle caption iStockphoto

There are about 400,000 greater sage grouse left on the landscape, spread across 11 Western states, from California to North Dakota. That's a fraction of what their numbers were just a century ago. Tom Koerner/U.S. Fish and Wildlife Service hide caption

itoggle caption Tom Koerner/U.S. Fish and Wildlife Service

President Obama makes his way across the tarmac Monday to greet well-wishers upon arrival at Elmendorf Air Force Base in Anchorage, Alaska. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

Delegates took their seats during the plenary session at the Bonn climate change conference on March 10, 2014. Negotiations resume this week; by the end of the year, the U.N. hopes to have forged a new global agreement. UNclimatechange/Flickr hide caption

itoggle caption UNclimatechange/Flickr

President Obama is renaming Alaska's Mount McKinley in an effort to strengthen cooperation between the government and Alaska Native tribes. The peak is returning to its traditional name, Denali. Al Grillo/AP hide caption

itoggle caption Al Grillo/AP

Professor Douglas Causey logs information as he tags and takes basic measurements of the birds he harvested in the Aleutian Islands on June 4. He is looking at the birds' blood and their diet, hoping to find out the ways the ocean is changing as it warms. Bob Hallinen/ADN hide caption

itoggle caption Bob Hallinen/ADN