Not all specimens upon which these maps are based have been verified. Backs of juveniles and tadpoles covered with small, evenly scattered black dots. Belly ranges from white to yellow, in some individuals marked with black spots or networks. Tympanum distinctly larger than eye. Males with single vocal pouch under lower jaw, yellow throat, larger tympanum and, during the breeding season, swollen thumbs.
Adult tends to be solitary.
Bullfrogs have been introduced as food for humans in some parts of the world. Thousands of eggs are laid in summer. Tadpoles overwinter and transform the following summer. Abundant statewide in permanent aquatic habitats.