Camels were imported to Australia to help with the exploration and settlement of the Outback.

The hardy monk parakeets, also called Quaker parrots or Quaker parakeets, have become famous residents of urban areas like Chicago’s Hyde Park.

descended from domesticated honey bees

A Bangkok alleyway (soi) is bound to have a few rather mangy residents.

Hardy fish like koi and common goldfish are able to survive is most freshwater environments even if they were born in a tank.  For other fish, like the Pearl Cichlids that wreak havoc in Northern Australian streams, a more specific settings is needed to survive.