Invasive species are species that are not native to Canada and that have invasive or aggressive tendencies.
Once here, invasive species can easily spread and outcompete native flora and fauna, upsetting the natural balance.
Invasive species arrived in a number of ways and over a number of years. The first invasive species to Canada arrived by ship with the early explorers.
Invasive species of high concern across Canada currently include Giant hogweed and zebra and quagga mussels.