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Genus Xenosaurus
Knob-scaled Lizard - These powerful, strong-limbed lizards have flat heads and robust bodies. When alarmed, Xenosaurus adopts a threat posture, with mouth agape, revealing a black membrane. The female gives birth to litters of 3 fully formed live young, which are about 4 cm long at birth.
Pallid Knob-scaled Lizard - Xenosaurus rectocollaris is a very flat-bodied Mexican lizard with its skin covered with granules and tubercles.