Baby elephants are a welcome sight in Zakouma National Park in Chad. Thanks to stepped-up enforcement, the park hasn't lost an elephant to poachers since 2012. Without the stress of poaching, the elephants started breeding again and more than 40 calves have been born. Brent Stirton/Reportage by Getty Images for National Geographic Magazine hide caption

toggle caption Brent Stirton/Reportage by Getty Images for National Geographic Magazine

In this image taken from a November 2012 video, Cecil the lion is shown in Hwange National Park in Zimbabwe. Paula French via AP hide caption

toggle caption Paula French via AP

Troy Capps found deer antlers in central Oregon's backcountry. Capps is a co-founder of Oregon Shed Hunters, a group that promotes ethical shed hunting. Courtney Flatt/Northwest Public Radio hide caption

toggle caption Courtney Flatt/Northwest Public Radio

A Maasai boy and his dog, near the skeleton of an elephant killed by poachers outside of Arusha, Tanzania, in 2013. Jason Straziuso/AP hide caption

toggle caption Jason Straziuso/AP

Miles Lappeman (left) and his son Marc with the carcass of a rhino that was killed for its horn at their Finfoot Lake Reserve on Nov. 24 in South Africa. This was one of eight rhinos slaughtered by poachers. Nicolene Olckers/Foto24/Gallo Images/Getty Images hide caption

toggle caption Nicolene Olckers/Foto24/Gallo Images/Getty Images