I helped fight a rook about a month ago...haven't seen one since. I took a picture of the rook flying, although I couldn't get a picture of my "cracked" computer screen. I think it is on my homepage under the snaps section if you want to view it.
I was booted out of the Ancestral Lands right into the middle of a Rook Attack today. Honestly, it was the first one I've really been in (a previous one that I stumbled on months ago was just ending as I transitioned onto the street). They are pretty cool...though I spazzed in trying to help revive animals. Looking forward to the next one.
marycontrary. you can get one if you use an external snapshot utility, suitable for capturing desktop items and windowed areas. The in game camera might not be enough.
If you're on a PC., you could look into something like "PrintKey2000" which last I checked was either free or very dirt cheap. For apple devices, I have no idea but I'm sure there's something.
There is also a lovely "snipping tool" on newer windows machines...I think Vista and Windows 7 has it as an accessory. Like it so much better than print screen since I can do automatic cropping with it, and save from the snipping tool window to a graphics file. For these types of files, you'll need to use something like Flickr or imgur to post the picture though since they won't save to your Glitchr snaps.