![Close up image of a mosquito on human skin.](https://oodmag.com/wp-content/uploads/2021/06/mosquito.jpg)
A multi-national study found the global cost of invasive species between 1970 and 2017 was $1.288 trillion US.
Over the same period, the authors pegged Canada’s cost at $22.8 billion.
The three species which caused the most damage were, in order, mosquitoes, rats, and cats.
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