Squirrels love to raid birdfeeders. Try installing baffles on the bird feeders or use feeders with weight-activated treadles to keep squirrels out. Do not allow bird seed to accumulate on the ground...it may attract squirrels, rodents, raccoons, and opossums. Using thistle seed instead of sunflower seeds or corn will help you attract song birds and may reduce the likelihood of attracting squirrels. You might also want to try safflower seed, birds will eat it but squirrels do not seem to like it.