Mac is freezing up: does this pic mean I need a new video card?

[tuqqer]

Thanks, all. I tend to agree (with the strong second possibility of it being birds. Lots and lots of birds).

If anyone has a link to video cards that I can use in the MacPro1,1 model, let me know.

I currently have the "NVIDIA GeForce 8800 GT 512 MB" card, so anything similar would be fine.