Some do & some don't almost all lizards reproduce with a mate, but some like the Racerunner are content to thereselves.
Female lizards have sac-like ovaries and large-yolked hard-shelled eggs for the protection of the embryo. The majority of lizards lay eggs, but in some lizards the eggs hatch inside the body and the lizard gives birth to live young. A minority of lizards give birth to live young following varying degrees of placental formation in a similar way to mammals.
Parental care is unknown in lizards, but in some forms the female broods, or cares for the eggs. Sexual maturity may be reached in the first breeding season after birth in small species, or not for several years in larger species. Generally the small forms live short lives of 1 to 5 years, whereas larger forms may live for 10 to 20 years or even longer.
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