How do these birds know the cats won’t hurt them? I’ve seen plenty of neighborhood cats catch birds, and it doesn’t end well for the bird. But nothing like that happens in any of these videos. Birds climb around on cats and walk after them and nibble their ears… and the cats don’t eat them.
Domestication! These aren’t wild creatures anymore: they live with us.
Now if we could only domesticate people, we’d have something there.