California-based Monterey Bay Aquarium is one of the largest in the world. As many others, it is closed to the public these days, but it offers ten live webcams. You can see, among others, sharks, penguins, jellies, birds, as well as the actual view of the Monterey Bay. Most of the cams work from 7 a.m. to 7 p.m. Pacific time. Here is the link: