The difference with Australia is that you're showing us mostly native wildlife. Here in South Florida, the weather is so mild, pretty much anything can survive. Those Anole lizards come from Cuba and other Caribbean countries. They probably came here in fruit shipments sometime in the 1970's or '80's. They pushed out many of the small native lizards that we had here.
A lot of the non-natives come from idiot pet owners who tire of fish and snakes that get too large for their tanks. They just go out to the Everglades and let them go free. That's where the Burmese Pythons and Oscars come from. Salt water aquaria owners let Asian Lionfish loose in the '80's and now, on some reefs between here and the Bahamas there are no more native fish. Just Lionfish.
http://www.nature.com/news/invasive-species-control-bounty-hunters-1.15916
Non-native species have been an issue here since the Conquistadors let their horses and pigs roam in the 1500's.
gatorcpa
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