A wood frog sticks it head above the surface of the water. It can be identified by the characteristic black marking on its face that resembles a robber’s mask and white upper lip. The frog is surrounded by water.
A wood frog visits a vernal pool in Chesapeake Beach, Md., on March 10, 2019. Vernal pools are seasonal wetlands that attract a range of amphibians, which use the fish-free environment to spawn and reproduce. Amphibians that breed early in the year, like wood frogs, are particularly vulnerable to contamination from road salts.

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