I have a number of foraging toys for Bennie. I switch them off occasionally for variety. Today I filled one that hangs on the side of the cage; the back is open. When I got home I let Bennie out. Later he climbed around the side of the cage and was helping himself to treats he snatched from the open part. At least it was a little bit of a challenge because he had to reach through the bars! I guess he thought he'd get them the easy way!