Vernal, or seasonal, pools are closed depression wetlands that remain ponded for varying lengths of time. Because of their annual dry periods, fish cannot become established within the pools. Without fish as the top-level predator, a unique assemblage of species have adapted to life within vernal pools. There are many amphibians and insects that require seasonal wetlands for reproduction.

Berks Co., PA, March 2004	Monroe Co., PA, March 2006
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Tioga Co., PA, November 2005	Tioga Co., PA, November 2005
Schuylkill Co., PA, December 2004	Schuylkill Co., PA, September 2003