Bird-voiced Treefrog  (Hyla avivoca)

Similar in appearance to the gray treefrog, but with a greenish wash rather than a yellow color along the inner thigh, is the bird-voiced treefrog, Hyla avivoca.  This small frog is 1 and a half to 2 inches in length and is found only in the undisturbed tupelo and cypress swamps in the western portion of Kentucky.  Its high-pitched bird-like whistling song is produced from perches in trees and shrubs within the swamps of the western coalfields and the Jackson Purchase.
 
 
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