New Zealand residents take notice when they see a red-eared slider on a riverbank.
Here in the United States there are a set of animals that you normally see. This varies by region, but we have pigeons, squirrels, chipmunks, innumerable varieties of birds, and in these parts there are the less-seen but ever-present raccoons, opossums, and even coyotes. These animals are all wild.
But visit a stream or a pond in a business park and you also see turtles. Usually, red-eared sliders. Of course they are native to the United States, but to a specific area: along the Mississippi and generally in the southeast part of the country. They do not naturally reside in Chicago, or New York, or the Bay Area. But if you've seen many man-made ponds or water retaining structures, or hiked along many rivers in the north, you've seen red-eared sliders far, far from home. Popular in the pet trade, you've also seen them in pet stores. But no businesses are running to pet stores to stock their ponds with the turtles; they simply show up.
They usually show up in the hands of their owners who release them into the wild. People tire of the care their pets require, they lose interest, or they realize that their pets have outgrown their aquarium and decide that the wild would be a better, more spacious place for them to live. No pet should ever be released into the wild. Not here in the United States, where red-eared sliders are native, because released pets can introduce unknown organisms into existing wildlife populations and wreak havoc. On a more personal level, an individual pet turtle may never learn how to take care of itself properly in the wild, and die.
And not in New Zealand, where red-eared sliders couldn't be much farther from home. You may not be aware of this, but there is hardly any wildlife native to New Zealand. A few lizards, frogs, and bat species are the only animals that originally lived on land in the country. New Zealand hosts many indigenous birds, many of which have lost their ability to fly since there are no ground-dwelling predators. (Though during my stay in New Zealand, disappointingly, I didn't see even a single kiwi they and many local birds are nocturnal.) Everything else in New Zealand the deer, the rats, the sheep, the cattle, the rabbits have all been introduced by humans. There should be no snakes, no opossums, and no chelonians, so when a passerby sees a red-eared slider on the bank of a river he doesn't dismiss it.
Such was the case when Donatello was found sunbathing in November. A lone turtle on a riverbank, he was captured and delivered to the Department of Conservation. It turns out that New Zealanders don't exactly freak out about the turtles, since the climate is considered too cold for them to breed and eventually destroy the ecosystem. They are available for purchase in pet stores. But they do have an effect on the fish and flora when they are released in the wild, since they do have to eat. Still, the fear seems to be only of what might occur in the case of significant climate change; it wouldn't have to get much warmer in New Zealand for red-eared sliders to take root there. For now, the locals are keeping an eye on the species.
Australians are far less forgiving: red-eared sliders are completely illegal.