There is a birds nest outside of my window and this morning I was sitting on my bed with my window open, it has a screen, and the curtains open and Pixie was on the bed with me when one of the birds came flying up to its nest and of course with the window open she could hear it clearer and she nearly jumped off of my bed at it and then she layed there like she was ready to jump at it and I guess it fooled her because it didn't fly infront of the window again.