After years of work, researchers identified a new species of leopard frog in New York City and surrounding counties, reports The New York Times' Lisa Foderaro. Rutgers University doctoral candidate Jeremy Feinberg first noticed the frog's distinctive vocalization on a trip through Staten Island in 2009, Foderaro says. "[He] heard something strange as he listened for the distinctive mating call of the southern leopard frog — usually a repetitive chuckle.

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