A boa constrictor usually gives birth to live young rather than laying eggs.
Boa constrictors are ovoviviparous: embryos develop inside eggs retained within the mother’s body, and the young emerge alive. This differs from true live-bearing mammals, because the developing embryos are generally nourished by yolk rather than through a mammalian placenta.
A female boa can produce a substantial litter, and the newborn snakes are independent soon after birth. They do not receive parental care comparable to that of birds or mammals. Reproduction varies with local conditions, including temperature, food availability, and the individual’s health.
This reproductive mode is easy to confuse with egg laying because eggs are still involved biologically, but they are not deposited outside the mother. By contrast, many other snakes, including numerous pythons and colubrids, lay eggs in protected sites.