Want to watch eagles and grizzly bears? Goldfish?
National Geographic has a webcam set up on the McNeil River in Alaska. The grizzlies are pulling salmon out of the stream. When I looked, there were a couple of seagulls waiting for their scraps, too. From 1 to 5 pm Alaska time (one hour earlier than Pacific), a ranger manipulates the camera for the best shots.
The eagles are in Maine, brought to you by the Biodiversity Research Institute. The camera is on a nest, where I didn't see any action, but they have archived images.
Both sites have blogs. The National Geographic bear blog runs excruciatingly slowly. I couldn't get it to load in any reasonable time. The eagle blog is written by three wildlife biologists and works better. It's quite informative, and it looks like they'll answer your questions.
And the Los Angeles Times's GoldfishCam is still operating. One of the goldfish has died, but the other still is perky in Los Angeles river water, which, if it hasn't been replaced, is probably pretty much like any other water, having been oxygenated and run through the filter for 149 days or so.