With a constant food supply in your backyard, you may find more birds deciding to nest nearby. Suet and other perishable types of foods should not be offered in warm weather because they spoil too quickly. Many folks get upset when they feed birds and suddenly begin to get visits from hungry squirrels. Just about anything you put out for birds to eat, squirrels will like also. The problem with squirrels at your feeder is that they eat large quantities of food and often gnaw at the feeder when it is almost empty to get at the last remaining portions.
People often go to extreme lengths to discourage squirrels from their feeders.
Inverted metal cones are often placed above or below a feeder to try to foil a squirrel from gaining access. Some people, myself included, actually enjoy having squirrels at the feeder. Squirrels are very entertaining animals to watch and are just as worthy of a helping hand as are the birds. But the best way to enjoy the squirrels and the birds both is to try to lure the squirrels away to a feeder that is designed just for them. Offer these on an open, platform style feeder and hopefully squirrels will be less of a problem at your bird feeding station.