California Lyresnake vs. Red Diamond Rattlesnake

Both live on rocky slopes and in chaparral in San Diego and Riverside counties; their records overlap. A: Flat, rounded at the back, no pit; a dark lyre mark on top in the California Lyresnake; broad and triangular, much wider than the thin neck; a pit between the eye and nostril in the Red Diamond Rattlesnake. B: Thin and pointed, no rattle in the California Lyresnake; black and white rings and a rattle in the Red Diamond Rattlesnake. C: Brown blotches split by pale bars in the California Lyresnake; reddish diamonds edged pale in the Red Diamond Rattlesnake.

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

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