Could have been MADTV:
http://www.youtube.com/watch?v=oc3AjsDoilg
Of course Mad TV was a lot more conservative than SNL, relatively speaking that is. So they had to cancel it.
> Robot Chicken had a skit where bird flu hit Sesame Street. Big Bird didn’t survive.
Actually, MADTY had the same skit!
http://www.youtube.com/watch?v=3K8KvHxh1VI