What is an invasive species?

These can be defined as animals and plants that have been introduced to a place where they do not naturally occur are known as non-native species. Many of these live happily in the UK without causing a problem but a few become what’s called invasive.

Invasive species upset the balance of the ecosystem as they may be bigger, faster growing or more aggressive than the native species. They adapt well and enjoy a period of population expansion as they may have fewer natural predators to control numbers. The native species are often unable to compete and fairly quickly the invasive species take over.

Can you name the three species below?

A great link to find out more about these species is here

New Zealand WillowherbHimalayan balsamJapanese knotweed

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