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A northern leopard frog heads back to freedom after being caught by ecologist Christine Prah. Prah, a seasonal researcher with the City of Boulder's Open Space and Mountain Parks department, is surveying for the presence of northern leopard frogs, a once common amphibian that is now being considered for listing as federally threatened under the Endangered Species Act. Boulder is one of the few places along the front range where these frogs can be found. (Photo/Morgan Heim)