1 1/8-2 1/8" (2.9-5.2 cm). Greenish, brownish, or shades of gray, with darker blotches on back; dark-edged light spot beneath eye. Hidden surfaces of thigh green to greenish-yellow. Toe pads large.
Western (H. a. avivoca), smaller size, white or pale yellow light spot beneath eye; Illinois to Louisiana and w. Florida.
Eastern (H. a. ogechiensis), larger size, yellow or green light spot beneath eye; c. Georgia and sw. South Carolina.
The most beautiful frog call in North America; a resonant, birdlike whistle. Males call while perched on shrubs 3-5' (1-1.5 m) above water.
March to September.
Wooded river swamps and bayous. Especially frequent in cypress, tupelo, and other trees that grow in standing water, and creepers that grow among the trees.
Extreme s. Illinois southwest to Florida panhandle and south to Louisiana. Isolated populations in ne. Georgia and on the Georgia-South Carolina border.
Nocturnal. This species is almost never seen except during nighttime choruses; apparently it remains in the treetops during the day. Its skin secretions may cause runny nose and watery eyes in people who handle it.