Island Night Lizard
Xantusia riversiana
A unique looking lizard that somewhat resembles a gecko. It has smooth plate-like scales on its relatively large head, rough granular scales on its body, and bands of sha…
How to identify
A unique looking lizard that somewhat resembles a gecko. It has smooth plate-like scales on its relatively large head, rough granular scales on its body, and bands of sharply keeled scales on its tail. It has vertical pupils, a pointed snout, and a thick neck. It is generally dark grey-brown with subtle mottling to match its dry, rocky surroundings. It has folds of excess skin on the sides of its neck and body.
Range
Endemic to the Channel Islands of southern California; specifically San Nicolas Island, Santa Barbara Island, San Clemente Island, and Sutil Island.
Habitat
This lizard prefers dense thickets of boxthorn and cacti in coastal scrub habitats. Often seen on rocks or rocky substrate.
Variations
Juveniles have a pair of cream-colored longitudinal lines bordered in black on their back, from the neck to the base of the tail. Some have rusty brown and white speckles mixed into their mottled pattern.
Similar species
Shares similar features with other members of the genus *Xantusia*, including the desert night lizard (*Xantusia vigilis*), Baja California night lizard (*Xantusia wigginsi*), and Bezy's night lizard (*Xantusia bezyi*).
Name and etymology
Riversiana: Honoring James J. Rivers.
At a glance
Range
Endemic to the Channel Islands of southern California; specifically San Nicolas Island, Santa Barbara Island, San Clemente Is…
Habitat
This lizard prefers dense thickets of boxthorn and cacti in coastal scrub habitats. Often seen on rocks or rocky substrate.
Guide
Reptiles and Amphibians of North America
Range map
Approximate range. © Mapbox © OpenStreetMap