Unfortunately, we like pets that are likely to be invasive species

Image of a snake fighting an alligator.

Enlarge (credit: Lori Oberhofer/NPS)

In addition to being home to men with questionable decision-making skills, Florida also seems to have some issues with bizarre animal behavior, whether it’s freezing iguanas dropping from trees or alligators battling pythons in the Everglades. When it comes to those animals, however, Floridians can truly put the blame on non-natives. Neither pythons nor green iguanas made the sunshine state their home until we brought them there as pets.

In fact, there are lots of problematic invasive species that have spread through the pet trade, from predatory fish that can drag themselves between bodies of water to a crayfish that clones itself to reproduce. Those high-profile cases lead to some obvious questions, like whether pets really are more likely to be invasive and, if so, why?

Two Swiss researchers, Jérôme Gippeta and Cleo Bertelsmeier have now attempted to answer these questions. And their conclusion is that yes, our pets are more likely to be problems.

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