Gathering sticks

I mentioned this particular hobby of Wolfie last year. We went to a walk this weekend and Wolfie took the opportunity to renew his old activity/game: collecting sticks on the way. Now he has special criteria for them: they must be no longer than his arm's lenght. I have no idea why, but he's adamant about this. And what does he do with the sticks? Nothing.Sometimes he does not even bring them home. But for a while in our walks, he carries one stick or two, sometimes a bunch of them, for whatever reason. Somehow, it gives a sort of purpose to our walks.