Twisted Lion (Sea Lion that is)?

Several Sea Lions at Sea Lion Sound in the St Louis Zoo like to follow or chase a hat that is held up to the glass in the observation tunnel. This is another picture of one that was following my hat up and down, literally round and round (doing circles) and from one side to the other! Occasionally I would set my hat on the ledge and the Sea Lion would look at it, then look at me, as if to say "come on, move it".