Amberlee,
That sounds like what happened to my cat Dutchess on Sunday morning...
Dutchess was sitting on top of the cat tree facing the huge window that is in the den. Outside is the only tree we have and I have a bird feeder hanging from it. Well, Dutchess sees this bird sitting there in the birdfeeder. She goes all crazy. She starts making this noise like we have never heard and then she starts moving the virtical blinds away so she could see better and stretches her neck as far as she can to the window. It was so funny my husband and I just watched and laughed.
Must get a window sit for t hem.

http://pepeirce.tripod.com/thekittycorner