Cats are cool. I like watching 'em. There's also a new trend of Live Eagle Cams and they can be fascinating (there are a bunch of em, so I won't link to one: google "Live Eagle Cam") and addicting. I watched one for six hours straight and I wasn't even sick and I didn't regret the wasted time because it wasn't wasted.
Caution: It's nature in the wild and nature can be cruel or at least cavalier, including eagle siblings stealing food from each other and trying to knock each other out of the nest in a fratricidal attempt to get more food and attention. I've known people who showed it to their kids and regretted it.
There's a cool Pier 39 Sea-Lion-Cam too. Above guidance applies there too. They can be mean to each other and other animals