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Scientific name: Sceloporus occidentalis
Common name: Western Fence Lizard
Size: 1.97-3.31 in (5.0-8.4 cm)
Distinguishing characters: A robust species; dorsal scales keeled and pointed; dark brown or black blotched pattern; small blue spots on back and large one on throat; blue ventral patches, with a black mid-ventral stripe separating the patches; yellow or orange on rear under surfaces of limbs.
Juveniles: Lacks blue on throat; blue ventral patches faint or absent.
Dimorphism: Swollen tail base in males with paired enlarged scales just posterior of vent, and femoral pores; female has less vivid markings and lacks, or has smaller, pale blue ventral patches (see photos below).
Similar species: Uta stansburiana: Has black to blue blotch behind forelimbs.
Additional notes: A common species occurring throughout study area. This lizard is often referred to as the "Blue Belly" owing to the large blue patches on the ventral surface of the mature males.
![]() Underside of Male | ![]() Underside of Female |
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