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Tiger snakes give birth to 20 to 30 live young; an exceptional record was made of 64 from an eastern female. [8] They usually mate in spring when it is in the warmer seasons and will give birth to live young in summer.
Like other natricine snakes such as water snakes (genus Nerodia) and garter snakes (genus Thamnophis), S. dekayi is a viviparous species, giving birth to live young. [13] Sexual maturity is reached at two to three years. Mating takes place in the spring, after snakes emerge from brumation. Between 3 and 41 young are born in late summer. [14]
A Brazilian rainbow boa constrictor kept at a school in England gave birth to 14 babies last month, despite having no contact with another snake for nearly a decade.
Rubber boas are viviparous (give birth to live young) and can have up to 9 young per year, although litters of 1–5 are much more common. Rubber boas are less prolific than many snakes found in the US and Canada with females only reproducing on average once every four years.
The red-bellied black snake is ovoviviparous; that is, it gives birth to live young in individual membranous sacs, [20] after 14 weeks' gestation, [35] usually in February or March. [41] The young, numbering between eight and 40, emerge from their sacs very shortly after birth, and have an average length around 12.2 cm (4.8 in). [42]
Ronaldo, a 6-foot Brazilian rainbow boa constrictor kept at a school in England, was thought to be male — until the snake gave birth to 14 babies last month.
The black swamp snake is ovoviviparous, giving birth to live young directly in shallow water. Unlike many snakes, females feed actively while gravid, suggesting that they may pass nutrients directly on to the young. Broods of 11 to 13 have been observed. [9] Newborns are 11–14 cm (4.3–5.5 in) long (including tail). [7]
Instead of laying eggs, the rinkhals gives birth to live young. They give birth to around twenty to thirty live young, but some females can give birth to over sixty live young. [10] Rinkhals usually give birth in the late summer, which in the southern hemisphere corresponds to the months ranging from December to March. [10]