You can squirrel-proof bird feeders by using a baffle. These covers can prevent the squirrels from accessing the food but allow the birds to stop still and have a bite. Try to place your bird feeder in a place that’s more difficult for squirrels to reach. Use stand-alone feeders rather than those that hang from trees. You can also attempt to coat the stand in something friendly like coconut oil or Vaseline. The squirrels can’t get a grip and just slide down.