The Invaders - The 10 Worst Invasive Species

Aliens are occupying great swathes of the environment. These invaders are not from outer space, but from other parts of Earth and have been introduced by accident or on purpose to devastating effect. Animals such as the cane toad or grey squirrel and plants such as the Japanese knotweed or water-hyacinth have invaded new habitats, killing off the local wildlife and ruining the local economy.

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Dutch elm disease

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Dutch elm disease
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Elm tree with Dutch elm disease

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Elm tree with Dutch elm disease
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Tropical seaweed

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Tropical seaweed
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Invasive seaweed

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Invasive seaweed
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Wood anemones

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Wood anemones
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Eichhornia crassipes Water Hyacinth.

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Eichhornia crassipes Water Hyacinth.
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Overgrown canal

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Overgrown canal
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Companion planting

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Companion planting
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Sectioned water pipe clogged with Zebra mussels

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Sectioned water pipe clogged with Zebra mussels
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Zebra mussels being cleared from power station

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Zebra mussels being cleared from power station
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Ant stings on ankle

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Ant stings on ankle
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European spruce bark beetle,SEM

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European spruce bark beetle,SEM
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Coloured SEM of a fire ant, Solenopsis sp.

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Coloured SEM of a fire ant, Solenopsis sp.
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Red imported fire ants on wooden stick

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Red imported fire ants on wooden stick
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Apple snails

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Apple snails
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Hand holding Zebra mussels, Dreissena polymorpha

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Hand holding Zebra mussels, Dreissena polymorpha
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Cane toad, Bufo marinus

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Cane toad, Bufo marinus
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Brown tree snake (Boiga irregularis)

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Brown tree snake (Boiga irregularis)
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Grey squirrel

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Grey squirrel
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