Three or four years ago, our dog Duncan was sticking his nose into the drain before him. I wondered what he was doing and heard, as he obviously did, chirping sounds within. At first, I thought a bird had fallen into it. Instead, it was a chipmunk. It came running out, and off went Duncan after it!
Now, if I ask him, "Where's the chipmunk?" he runs to the drain, barking and pawing at it.