No. Only 70 percent of the world's snakes lay eggs. The rest give birth to live young. Oviparousor egg-layingsnakes tend to live in warmer climates, which helps incubate their eggs. Viviparousor live-birthingsnakes tend to live in cooler regions, where the ground is too cold for the eggs to develop on their own.
The Boas of Belize Premieres Wednesday, February 5, 2003 at 8 p.m. ET/PT on the National Geographic Channel Travel to Belize to visit six-foot boa constrictorsand their much, much larger cousins.