In this Thursday, June 29, 2017 photo, children explore an exhibit at the new Zoo Academy and Children's Adventure Trails at the Henry Doorly Zoo in Omaha, Neb. (Matt Miller/Omaha World-Herald via AP)
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In this Thursday, June 29, 2017 photo, children explore an exhibit at the new Zoo Academy and Children's Adventure Trails at the Henry Doorly Zoo in Omaha, Neb. (Matt Miller/Omaha World-Herald via AP)
