>>822898>because they don't do well in the wild.they don't do well individually, they do fine as a species.
'An invasive species is a plant, fungus, or animal species that is not native to a specific location (an introduced species), and which has a tendency to spread to a degree believed to cause damage to the environment, human economy or human health.'
they don't have to be naturalized.
cats are literally the most invasive pest species on earth, they're worse than canetoads and rats combined.