This is our most popular feeder!! It is ideal for the most beautiful songbirds like chickadees, gold finches, rose breasted grosbeaks and cardinals to name a few! It has a solid brass grill at the front that prevents the squirrels (red,grey,black) from getting their body past this point. The inside of the feeder has baffles that keeps the seed out of their reach! Often times with window mounted feeders squirrels are not a problem as they can NOT climb glass! But they are great jumpers so this feeder ensures that if they get there…they won’t be there for long!! It also keeps out large birds like grackles and starlings!! Perfect!