In many parts of the world, they have native animals that exist in perfect harmony. Then people bring in animals from other parts of the country or world and these non-native animals can often wreck havoc on the native species in a particular area.
Florida has listed over 4,000 non-native species that they consider invasive based on their impact on the environment. Curiously, ordinary house cats are also considered invasive species because they kill birds, rodents, and anything else they can get their furry little paws on. So if you want to protect Florida’s natural wildlife, keep your cat indoors.