Boa Constructor Weight: 60 kg Size: 3 - 5 m Life expectancy: 40 - 50 years Occurrence: mainly in South and Central America, the Caribbean, Madagascar Worth knowing The boa molts every 6 - 8 weeks. Do you know why she's doing this? No?! Then pay attention! When crawling, their skin is subjected to a lot of wear and tear. Therefore, she must shed her skin to renew them. First, the skin on the animal's head peels off and is then gradually shed as the snake crawls on.