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Although many kinds of snakes and other reptiles are oviparous (lay eggs), rattlesnakes are ovoviviparous (give birth to live young after carrying eggs inside). [77] The female produces the ova ("eggs") in her ovaries, after which they pass through her body cavity and into one of her two oviducts.
The common watersnake mates from April through June. It is ovoviviparous (live-bearing), which means it does not lay eggs like many other snakes. Instead, the mother carries the eggs inside her body and gives birth to free-living young, each one 19–23 cm (7 + 1 ⁄ 2 –9 in) long. [25]
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.
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.
They typically lay 12 eggs in sand or other protected areas and leave the eggs to incubate unprotected. Clutches of five to 22 eggs have been observed. The eggs are elliptical, leathery, rough, sticky, and up to 70 mm (2 + 3 ⁄ 4 in) long. [17] The eggs typically hatch in August or September. Baby bull snakes are 20–46 cm (7.9–18.1 in) at ...
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.
Arboreal snakes generally have better vision than burrowing species. Some snakes, such as the Asian vine snake, possess binocular vision, enabling both eyes to focus on the same point. Most snakes focus by moving the lens back and forth relative to the retina. Diurnal snakes typically have round pupils, while many nocturnal species have slit ...
Boids are, however, distinguished from the pythons in that none has postfrontal bones or premaxillary teeth, and that they give birth to live young. When labial pits are present, these are located between the scales as opposed to on them. Also, their geographical distributions are almost entirely mutually exclusive.