Length 3/4 – 1 1/4 in. (2-3 cm). At the first hint of spring, the Spring Peeper makes its appearance, often while traces of ice still remain on the shallow breeding ponds. Although small enough to sit comfortably on a dime, this tiny tree frog has a shrill, birdlike peep or whistle which can be heard for a surprisingly great distance. The Peeper can easily be identified by the prominent dark “X” marking on its back, as well as by its characteristically rounded tree- frog toe pads. After the breeding season, Peepers move upland to moist woodlands where they spend the summer hiding among the shrubs and feeding on insects and other small organisms.
Text courtesy of the Ohio Division of Wildlife: https://wildlife.ohiodnr.gov/portals/wildlife/pdfs/publications/id%20guides/pub348.pdf