They can definitely leave me scratching my head sometimes. We have a garden that is fenced off during growing season - no ducks allowed! This fall, after we harvested everything, we removed the fence leaving a a lovely area chock-full of insects of all sorts. The ducks refused to go into the garden, even when encouraged. They said there was a fence. I agreed, but told them the fence was now gone. They pondered that for a long while, then stated that they weren’t allowed and weren’t going near it! Their loss, I guess!