Nearly 300 endangered northern leopard frogs returned to the wild at the Columbia National Wildlife Refuge in Grant County at the end of August.

7 ‘Extinct’ Species That Eventually Reappeared ... Zanzibar Leopard A preserved Zanzibar leopard, which may have been caught on camera a few years ago. Image: Wikimedia Commons .

The Indochinese leopard is dangerously close to becoming extinct in Cambodia, according to wild cat conservationists, who spent more than a decade looking for the creatures and found just 35.