In Gila monsters, spermiogenesis, courtship, and mating occur in late April through early June. Eggs are laid in July and August, which coincides with the onset of the summer rains in the southwestern deserts. Hatchling Gila monsters do not emerge until the following April. The clutch size varies from two to 12, with a mean of 5.7. Hatchlings have a snout-to-vent length around 4.5 in (110 mm) and average 6.5 in (165 mm) in total length; they weigh 1.2 oz (33 g).
In beaded lizards, spermiogenesis, courtship, and mating take place in September and October. Eggs are laid between October and December and hatchlings appear in June or July with the onset of the wet season. The clutch size ranges from two to 22 eggs with a mean of seven to nine. Wild hatchlings have a snout-to-vent length of 4.5-5.0 in (115-127 mm) and weigh 0.8-1.0 oz (23-27 g).
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