In this May 19, 2015 photo provided by the Chicago Zoological Society, in Brookfield, Ill., Will, a 1-month-old okapi calf is shown at the Brookfield Zoo, in Brookfield, Ill.. The okapi, also known as the “forest giraffe” is a rare hoofed mammal native to the dense Ituri Forest in the Democratic Republic of Congo. (Photo by Jim Schulz/ Chicago Chicago Zoological Society via AP Photo)
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