Air4Andy: Thanks for the googlesuggestion. I founda very cool site, IMO, with lots of animal and other sound effects. Here is the web address, in case you're interested:

http://www.partnersinrhyme.com/soundfx/animals/BigCats.shtml

I still don't know which it was, based on these sounds, but it was just so loud, it was hard for me to believe an animalas small as a bobcatsmall could make such a loud, long, extended sound like that, just because of the lung capacity I would think was necessary.

Here are the closest sounds from that web page:
http://www.sound-effect.com/sounds1/animal/BigCats/BOB-CAT.wav
(the kind of second growl/scream, but it was more extended)

or this one:
http://www.sound-effect.com/sounds1/animal/BigCats/cougar3.wav
(again, it was more extended; at least twice as long)