Mexican White-lipped Frog vs. Rio Grande Leopard Frog
Both call from flooded fields, ditches and resacas in the Lower Rio Grande Valley after rain. A: No webbing between the toes in the Mexican White-lipped Frog; toes joined by webbing in the Rio Grande Leopard Frog. B: Brown or grey with a few dark spots in the Mexican White-lipped Frog; many sharp dark spots on a pale greenish-tan back in the Rio Grande Leopard Frog. C: A bold white stripe along the upper lip in the Mexican White-lipped Frog; no bold white lip stripe (a faint pale line at most) in the Rio Grande Leopard Frog. The White-lipped Frog calls a rising whistle ('whoit') from a burrow; the leopard frog gives a short, guttural rattle.
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