Squirrel's are to be given contraceptives in a project approved by Scottish ministers. The Executive has agreed to fund research into immuno-contraception for Scotland's grey squirrel population.
Ministers want to know if contraception can be given to squirrels safely and effectively and whether this could solve the problem of the rapidly expanding grey squirrel population and the declining red squirrel one.
A Scottish Executive spokesman said it was impossible to say how much money would be spent on the scheme because it was being pursued with both the UK government and the Forestry Commission.
He said scientists were experimenting with a "fertility control agent" which had been used successfully in the US and was now being tried on a range of species, not just squirrels.
The squirrels are caught in humane traps before being given the contraceptive.
The spokesman said: "The materials are administered by injection, and recent formulations can render an animal sterile for a number of years with a single dose."
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