Someone on a mailing list I'm on linked to a YouTube video of tourists in Africa who caught on tape a confrontation between a group (herd?) of buffalo and a pride of lions. The lions manage to catch a buffalo calf, but I'm going to give a spoiler now for those who might be concerned - the calf survives, and it seems to be fine at the end of it all. There's another animal that gets involved in the struggle for the calf as a prize, but I won't give that part away. I'm just going to say again, the calf survives. There are parts of the video that are a bit difficult to watch, knowing it's real life. Yeah, circle of life and all that, but it's still hard when you know it's real. But it's also fascinating. The entire video is fairly long (about 8 1/2 minutes), but it's worth watching the whole thing.
Here's the link if you'd prefer to watch it in a bigger format.