Whenever I put seed in the bird feeder a squirrel helps himself to dinner. I don't mind because it's fun to watch.
The feeder is almost empty but he finds whatever seeds are left.
Here he's sticking his head inside the plastic seed holder plate by lifting it with his nose. I once had to help a squirrel get out after he trapped himself inside. Later I saw him lift the plate with his hand to get in and out. He was a fast learner.