The owl that you can meet on some solitaire levels is a cunning creature! 🦉
It will try to disturb your game by flying from one card to another. The card with the owl cannot be removed from the table.
You may also notice owl nests on other cards. Be attentive, that's how the owl marks those cards it is ready to fly to at any moment! Cards with a nest can be removed before they are occupied by an owl.
You better get those cards off the table as soon as possible to chase the cunning bird away and prevent it from getting in your way.