What looks like a fight between two lizards, is actually a form of lizard courtship, a lizard love bite if you will. Museum herpetologist, Dr. Greg Pauly says, "male alligator lizards bite the female behind the head during mating, which holds her in place until she is ready." Lizards have been observed in this position for a long time—sometimes over an hour, and oftentimes moving through open spaces which makes them easily visible. Some people speculate that the mating hold is a show of strength by the male, to prove how worthy of a mate he is. However, as Greg points out, there's no data to support this claim but he concedes that it could prove to be true.
All of this might sound a little harsh to some people, but this mating behavior has not been known to harm the female. If you see lizards engaged in this behavior, please do not try to separate them or move them, as this could harm the lizards. This is their normal behavior, and an integral part of their mating ritual.
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