Winking as an effective communication tool can work in many forms. It can be used to share a secret between two, when you pull a leg or crack a joke or just use in flirtation to signal the message: “I’m attracted to you”. This all what Wikipedia says works in humans!!!!
But when the wise feathered one perches next to the window that you gazing out of and then winks at you, what may the message be. I would settle for flirtation I guess😛