The pickerel frog can be identified by its two rows of somewhat square or rectangular spots on the back. It is usually gray or tan with bright yellow on the rear of the thighs and the belly. This one-and- three-quarter to three-inch frog is found only in the extreme northern, western and southwestern portions of Illinois. It appears to be intolerant of warm, sluggish water except in southern Illinois where it can be found in floodplain swamps. Elsewhere it can be found in cool, clear streams and caves. The eggs are laid from April to mid-June in the quiet waters of bogs, lakes, woodland ponds and river sloughs. The call is a short, rough snore with little carrying power.