Garter snakes don’t lay eggs. Like many different snakes together with boas, they’re ovoviviparous. Ovoviviparity, ovovivipary, or ovivipary, is a mode of copy in animals through which embryos develop inside eggs which might be retained throughout the mom’s physique till the offspring have totally developed. The eggs incubate whereas nonetheless contained in the mom. This is a Thamnophis ordinoides (Northwestern Garter Snake) giving birth to six reside infants. Gestation (truly, incubation) takes 60-90 days.