Many of these exotic animals can be legally purchased at the United States with an appropriate permission. In most parts of the world would not be possible, by its legislation, the legal possession of these animals.
Properly care for certain exotic animals is no easy task, food based on prey alive and space requirements are difficult to reconcile life in the small floors of European cities.
To do this, is compounded by the lack of sunlight, important for the metabolism of calcium in many reptiles, as turtles or lizards. Isolation faced many alone kept individuals in captivity makes dent in animals belonging to species of social nature, animals who greatly need the presence of other individuals of the same species.
Exotic by not live under better conditions animals react to the stress of captivity to develop.