Nora's favorite seat in the house

Lately, Nora has spent hours perched on the stairs watching rabbits, squirrels, and birds. At least she doesn't bark, but she is very persistent in her attempts to catch a glimpse of yard varmints. If I call her away, she'll patiently wait for me to pet her for about two minutes before running back to her window. I'm hoping at some point she'll get over this obsession, because when she's intent on her window, she isn't much fun. Oh yes, and she's the one who put her tennis balls on the window sill (I was trying to get her to play).