Strecker's Chorus Frog vs. Boreal Chorus Frog

Both call from flooded fields and ditches in late winter and spring; they meet in south-central Kansas and Oklahoma (records share 3 one-degree squares). A: A dark spot below the eye breaks the pale lip line in the Strecker's Chorus Frog; an unbroken white line along the upper lip in the Boreal Chorus Frog. B: Irregular dark spots, sometimes joined into two long bars in the Strecker's Chorus Frog; three dark stripes (or rows of dashes) down the back in the Boreal Chorus Frog. C: Stout, with thick forearms in the Strecker's Chorus Frog; slim, with thin forearms in the Boreal Chorus Frog. Calls: Strecker's gives clear, high single-note whistles; the Boreal Chorus Frog a rising 'crreek' like a thumb run along a comb.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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