There is expanding evidence that grey squirrels are impacting indigenous timberland bird populaces. It is believed that these immigrants are affecting birds in 3 means. Firstly by eating eggs as well as infant birds from the open nests of birds such as finches and also yeast infections and discouraging birds from making use of nest boxes. Secondly, squirrels utilize excellent nesting areas that would generally be inhabited by birds such as the tawny owl, kestrel, jackdaw, supply dove and also starling.