this is much like the Monk Parrot (Quaker Parakeet) colony we have here in Chicago, and there are many other breeding colonies in other cities across the U.S. there are so many breeding populations that some states have banned them and you can be fined for posessing a Quaker, and in some states it will be imediatly euthanized. some Quakers may have escaped by accident, but there have been mass releases by PTA and other animal rights extremeiststs that have lead to the deaths of many of these birds, either from food depirvation, being captured and euthanized, or freezing or being killed by harsh waether. needless to say, the population of Quakers keeps growing. i do not agree with releasing fish/birds/cats/dogs/ rabbits etc. etc. etc. whatsoever (especially because of the risks as mantioned above, and because they have learned to depend on people for food) back to the fish... well, there are numerous Aisan carp poulations in the Du Page River that were released by people that were origionally pets (may have been koi and reverted back to their natural state) and dont serve much of a problem, but they have reduced natives in our area by a bit. there are also snake head incidentsin remote lakes where the local population has be totally decimated by these predators.