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what evidence is there that competition with gray squirrels is responsible for the decline in red squirrels in the UK

User Hpm
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There are currently three schools of thought on the subject: Greys are actively fighting and driving out Reds; Greys are out-competing Reds for food, space, breeding sites, and so on; and Greys are spreading disease that is killing off Reds.
User Juan Cabello
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