Possibly the most awesome title I ever had the pleasure in writing BTW.

I have never seen this clip before, and I have seen many a nature clip in my day.

From a new source I've never seen before - Vidipedia  Which looks interesting but hasn't been updated for over a month, so assume they didn't work out.

Bear vs Cougar. Type who you think wins before you click play. And if you want to play on a grand scale this video is free for the sifting.

*edit ok I switched to the Youtube Embed, Vidipedia wasn't working too well.

.. Also, I'm still working on the Carl Sagan Serp over at Mahalo, found an A&E Biography that some might enjoy, Actually just search Here are the Sift and find top Sagan Videos.
I was going to post the Bio here, but in my search I found this interesting clip. I submitted it to the sift in the past and don't know why it was discarded?