When I put out food for the birds, I also scatter some "critter mix" at the edge of the driveway for the other animals that live among the old Spruces on our property. Normally they all get along, but I've noticed an ongoing turf war between the scrappy gray squirrels and the plumper grumpy red squirrels.
Mr. Red Squirrel had the seeds to himself. (Actually here in Chicagoland the red colored squirrels aren't true North American "Red" squirrels but are Eastern Fox Squirrels.) Along comes an interloper, Mr. Gray Squirrel.
"Mom, they're using the Force again!"
Yup - endless entertainment for the cost of a bag of seed and nuts.