Check out the AfriCam, where you can watch live footage of the happenings at a watering hole. The webcam is located at a private game lodge in the Kruger National Park in South Africa.
You make also want to check out a YouTube video of a battle between a herd of water buffalo versus a pride of lions. Its a little long, but it has a good ending!
Here is another cool Wildlife Cam about eagles:
http://www.wvec.com/cams/eagle.html