Anatomy and Physiology
Spring Peepers are tan or brown in color with a dark cross that roughly forms an X on their dorsa (thus the Latin name crucifer, meaning cross-bearer), though sometimes the marking may be indistinct. They have a body length between less than an 1 inch (25 mm) to 1.5 inches (38 mm) and a weight between 0.11 ounces (3.1 g) to 0.18 ounces (5.1 g).
The species have large toe pads for climbing, although they are more at home amid the loose debris of the forest floor.
The color variations of the P. crucifer are mostly tan, brown, olive green, and gray. Females are lighter-colored, while males are slightly smaller and usually have dark throats. This frog has a vocal sac located by its throat, which expands and deflates like a balloon to create a short and distinct peeping sound. Only males have the ability to make this loud high-pitched noise, and they use it to attract mates.
Read more about this topic: Spring Peeper
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