What's that staring in the Picture Window?

Not long after I bought my lovely 3000 square foot home, my son and I discovered this creature in the above picture staring through the Bow window on the back of the house. The photo has not been modified in any way. The Silver Maple actually has those owl eyes. She is about 80 years old and predates the house. I cannot call her a House Hugger. She, rather stares through the window. My son an I affectionately call her Gertrude. The river in the background is full of her offspring.
Here in the background behind Gertrude is the enormous Cottonwood of one of my previous post, Bill. My backyard is a grove of trees that predates the house.