Lesser Siren vs. Greater Siren

The two sirens share the swamps, ditches and weedy ponds of the southern coastal plain; a small Greater Siren is easily taken for a Lesser (NC Parks). A: Slimmer, 6 to 15 in in North Carolina in the Lesser Siren; bigger and heavier, up to about 30 in in the Greater Siren. B: Fine black dots, no pale blotches in the Lesser Siren; often yellowish or pale blotches along the sides in the Greater Siren. The Lesser Siren has 31 to 35 grooves along the side between front leg and vent, the Greater 37 to 40.

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

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