(Beckie Garbett | AP) In this photo taken on Feb, 3, 2016, and supplied by researcher Beckie Garbett on Wednesday April 4, 2018, white-backed and hooded vultures feed on a dead elephant carcass in Chobe National Park, Botswana. Poachers, poisoning and other hazards have taken a heavy toll on Africa's threatened vultures as well as the threat of toxic bullet lead that they ingest while eating the carcasses of animals shot by legal hunters.