Via U.S. Geological Survey:
Spotted Salamander — Ambystoma maculatum, have been a focal species for amphibian monitoring at the USGS Patuxent Wildlife Research Center for many years. At one of our study ponds, we used the unique spot patterns of each salamander as a way to "mark " individuals, and thus to calculate population estimates. Photo by Evan H.C. Grant, USGS.
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