According to a National Academy of Sciences report, certain small- to medium-sized mammals have declined by 99 percent in surveyed areas of Everglades National Park, with Burmese pythons considered the likely causal factor.
Dogs and cats were domesticated for thousands of years, and they have a place in our homes. The large constricting snakes we are talking about are wild animals, native to Africa, Asia and South America. While we agree that they are fascinating and remarkable animals, they are best suited in their native environments, and they don't belong in the wildlife trade or in our bedrooms and basements. They die during capture and transport. In the end, too many people get them and then tire of them or realize that they do not have the resources, space and expertise to care for them properly, and release them. Some of the snakes adapt to the wild, becoming invasive species.
Boa constrictors, the most popular of the nine large constrictor snakes in the pet trade, are predators who can grow up to 13 feet long, and they can and have killed large mammals, including humans. They have now become established in Miami-Dade County and Puerto Rico, and if they become established like Burmese pythons have in south Florida, they could cost the nation tens of millions of dollars in eradication programs – to say nothing of the effect on native species of birds and small mammals, including endangered ones.