Squirrels are fun to watch as they frolic in the back yard. But they can also be a nuisance. They eat tulip bulbs and dig up newly planted annuals, leaving the small roots dying in the sun. And while we imagine that squirrels live happily in the backyard, well aware that they don’t belong inside, I think they see the house as an extension of their territory. The yard may be loaded with nuts, plants and yes, tulip bulbs, but the house is bound to be full of really exciting goodies. Which, to be