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A hyena and a group of vultures feed on the carcass of a giraffe killed by lions in South Africa's Kruger National Park, in this December 14, 2009 file picture. Africa's vultures are in serious decline, according to a report released on October 29, 2015, a situation that could impact human health and livestock as populations of other scavengers such as rats and jackals could rise as a result. The assessment, carried out by conservation group BirdLife International, found that six of Africa's 11 vulture species were at risk of extinction. (Photo by Mike Hutchings/Reuters)
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