Union Co., Illinois. October 8, 1977.
A little careful searching in the willows or among the plants alongside wet places will usually reward you with a green treefrog or two. Sometimes I find them far from the wet; once on a rocky, open hillside a half mile or more from water. The nocturnal chorus of cinereus is something to behold, especially if they are present in numbers. Their call is a loud, nasal queenk-queenk-queenk…and as a group they tend to call asynchronously, filling in the spaces in-between queenks. Removed from the synonymy of Hyla by Duellman, Marion, and Hedges, 2016, Zootaxa, 4104: 10
HerpMapper records for this species are here.