From chameleons to parrots to boa constrictors to sugar gliders, international trade in live animals is big business. Millions of live reptiles are traded annually to supply the international pet
market—the United States imports about half that number.
Leave the "Wild" in "Wild Animal"
Did you know collecting live animals from the wild can seriously threaten species? Sadly, for each animal that makes it to a pet store, many others
die en route. The uncontrolled collection of wild reptiles
and mammals can cause populations to decline to the point
of extinction. When they disappear from their habitat, the food chain can be thrown off, leading to population booms and declines among other species.
How Not to Say Goodbye
Exotic animals can also affect the environment into which they are introduced. Some people naively believe that, when they don't want their exotic pet anymore, it will be fine to release it in the nearest woods or stream—thousands of miles from the animal's home. In fact, invasive species are the second leading cause of species endangerment and extinction, after habitat loss.
Need Another Reason?
People with good intentions may accidentally harm their pets through a lack of understanding the animal’s needs. Unlike a dog or a cat, a reptile or exotic mammal does not tell you when it is uncomfortable. Your local veterinarian probably doesn't have the training to treat exotic animals. Your local pet store may not have the right food. Exotic animals may grow to many times their size as juveniles, and they may live for dozens of years. Obtaining a pet requires a commitment to care for the animal and provide for its needs throughout its life.
Finding the Right Pet
If
you do buy a pet, make sure you purchase a domesticated animal from a
reputable breeder that can provide documentation of captive
breeding. Be very thorough in requiring documentation. A captive-bred
animal does not affect the wild population.
Better yet, adopt a homeless animal from your local shelter. 
The Humane Society website offers useful information on pet adoption.
