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Island Night Lizard vs. Common Side-blotched Lizard

Both live on San Clemente and San Nicolas islands; their records overlap there. A: No dark blotch: mottled all over in the Island Night Lizard; a dark blotch behind the front leg in the Common Side-blotched Lizard. B: Big and chunky, soft-looking, under rocks and cactus in the Island Night Lizard; slim and quick, out in the sun in the Common Side-blotched Lizard. The Island Night Lizard has no movable eyelids and is out mostly at dusk.

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Island Night Lizard

Xantusia riversiana

Common Side-blotched Lizard

Uta stansburiana
Island Night Lizard vs. Common Side-blotched Lizard: comparison sheet with the differences marked

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

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