Spring Peepers, Pseudacris c. crucifer are generally light brown, with a dark brown, variable "X" pattern on their dorsum. This dorsal pattern accounts for their species epithet, crucifer, which translates as "one who bears a cross". They are the only small, light brown frog in Rhode Island, with this marking on their on the back.

Female spring peeper (left) and male (above)
The ventral skin (throat and belly) of females is uniformly colored usually a yellowish-beige.  Males have a dark, olive-brown vocal sac that appears as wrinkles on their throats (this allows the skin to expand when calling). The wrinkly sac is most prominent during the breeding season.

Spring peepers are adapted for climbing- Each toe has a flattened, terminal pad. The terminal pads aid in vertical climbing abilities by adding surface tension through mucous secretions; the secretions increases adhesive capabilities.


Not only are these creatures small
(2.6cm/ 1 inch) they are also extremely cryptic.