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Reproduction of the Boa Constrictor
The boa constrictor has appendages resembling claws on each side of its vent (genital opening). They are the remnants, or vestiges, of the hind limbs inherited from the boa’s lizard like ancestors. The appendages are generally larger in males than females and are thought to be used by the male to stimulate the female to mate. After fertilization, the eggs remain in the female’s body, where they develop over several months inside thin membranes. Unlike its close relative, the python, the boa constrictor gives birth to live, fully formed young. The protective membranes rupture as the young are released. As many as sixty snakes are born at one time, each measuring 17-20 inches. The young boa constrictor begins feeding within a week or two after its birth and grows quickly, usually reaching a yard in length after several months. It is sexually mature at 2-3 years when it reaches 6-10 feet.
The information below was provided by N.E.R.D. and can be seen at NERD
Common boa constrictors reach sexual maturity anywhere from 18 months (males) to 3 years (females) of age. This does not always mean that an 18-month-old male & 3-year-old female will be breedable, just a general age range. Breeding size occurs at lengths of 3'+ (males) and 6'+ (females). A female boa should be well-muscled and "thick" before breeding, without the lanky appearance of a subadult boa. Breeding season in captivity typically ranges from November to March. Stop all feeding at this time. Animals should be well established and in excellent condition before any breeding is attempted. Breeding may be induced by reducing daytime photoperiod to 8 - 10 hours and dropping nighttime temperatures into the mid 70's. Introduce the female into the male's cage approximately 7-14 days after feeding is stopped. Misting the animals with water may induce breeding activity. Ovulation in female boas is usually pretty obvious: thick mid-body swelling as if the animal has eaten a HUGE meal. Females typically shed 14-20+ days after ovulation. Provide a basking spot of 90 - 92 degrees for gravid females. After ovulation, females can be fed small prey items every 14 days if necessary. Female common boas may give birth to a litter of over 50 neonates after a 120 -150 day gestation period.