Rich people introduced the grey squirell in 1980 to British forests
Both animals have similiar body parts and features.
People find it cruel to kill all grey squirrels.
The grey squirrel can survive in hard winters because it can store more fat, whereas red squirrels may die.
Red squirrels die more of disease than grey squirrels.
Invasive species come from another habitats.
Grey squirrels are more intelleginet and adaptable to the new habitat.
But unlike red squirrels, grey squirrels are pests and destroy plants.
However, the grey squirrel is larger and bigger.
These species can grow and survive fastly because they have no enemies.
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