We are eagerly awaiting the first calls of the late winter-breeding Cajun chorus frogs (Pseudacris fouquettei), Spring peepers (Pseudacris crucifer), and Pickerel frogs (Lithobates [Rana] palustris). These frogs begin migrating to ponds, roadside ditches, and marshy areas with the first sign of warming weather and substantial rainfall. Spring peepers and Pickerel frogs occur only in the eastern third of Oklahoma, whereas various species of Chorus frogs occur throughout most of Oklahoma.
The Chorus frogs and Spring peepers are small frogs in the treefrog family (Hylidae). Chorus frogs are brown with darker brown stripes. Spring peepers are yellowish, with an irregular X on the back, from which the name, crucifer, is derived. Calls of these two frogs are easily distinguished. The Chorus frog call is a slow trill, similar to running a finger over a comb. In contrast, the call of the Spring peeper is a single loud whistle. When numerous individuals of these two species call from the same pond, the sound can be deafening! Males of both species call from perches on shrubs or small trees at the edge of the water or from clumps of vegetation in the water.
Pickerel frogs, which are in the “true” frog family (Ranidae), are moderately large frogs with two rows of squarish spots on the dorsum. Each frog has a different spotting pattern, making it easy to tell individuals apart. Pickerel frogs typically begin breeding in middle to late February, continuing into March. Their call is a low snore and can be difficult to hear if they are breeding in the same ponds as the louder Chorus frogs and Spring peepers. In addition, Pickerel frogs sometimes call under water, muffling their sound even more.
More to come when the frogs start breeding!