The grey squirrel is becoming more common in Northern Ireland. Its natural home is the oak, hickory and walnut forests of Eastern and North America where its numbers are controlled by owls, foxes and bobcats. It feeds on seeds and nuts (approx. 80g a day) and eggs, young birds and insects. Two litters are produced each year in early spring and summer. There are up to seven in a litter, but usually only three or four survive.