Cliff Chirping Frog vs. Rio Grande Chirping Frog
They now meet in Austin, San Antonio and the Hill Country, where the Rio Grande Chirping Frog has spread in potted plants. A: Light green, greenish-yellow or pale olive with bold dark brown or black blotches and crossbars in the Cliff Chirping Frog; yellowish-brown, tan or dull olive-grey with fine, irregular dark flecks; never bold crossbars in the Rio Grande Chirping Frog. B: Bold, high-contrast dark crossbands on the thighs and hind legs in the Cliff Chirping Frog; fine dark speckling or faint, blurry bars in the Rio Grande Chirping Frog. C: Head and body flattened, for squeezing into rock cracks in the Cliff Chirping Frog; rounder body, like other leaf-litter frogs in the Rio Grande Chirping Frog. D: Widened into broad, flat-ended pads in the Cliff Chirping Frog; only slightly widened, barely wider than the toes in the Rio Grande Chirping Frog. Size: the Cliff Chirping Frog reaches 1.5 in, the Rio Grande only 1 in. The Cliff Chirping Frog's chirp is lower (mostly below about 2,700 Hz). It lives in limestone cracks; the Rio Grande in gardens.
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Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.
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