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Common Side-blotched Lizard vs. Ornate Tree Lizard

Both are small, grey-brown lizards with small back scales and a fold of skin across the throat, so those do not separate them. A: the Side-blotched Lizard has a dark blue-black blotch on each side just behind the front leg; the Tree Lizard has none. B: the Tree Lizard's back is mostly tiny grains with bands of larger keeled scales running down it; the Side-blotched Lizard's back scales are all small and much the same size. The Tree Lizard is slimmer, with a longer tail, and climbs rock faces and trees; the Side-blotched Lizard is a ground lizard. Their ranges overlap across the Southwest (not in Idaho).

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Common Side-blotched Lizard

Uta stansburiana

Ornate Tree Lizard

Urosaurus ornatus
Common Side-blotched Lizard vs. Ornate Tree 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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