I'm not sure crabs can do much thinking beyond super basic stuff. My understanding is that crabs have sensory input and nerve response and not much else (phew). But this is a very good parallel and warrants some further thought. You could ask, “do fish think crabs are invincible?” Crabs can walk but can't swim. read more
My usual thought process when I see a flying fish is, oh good, there are probably bigger fish around that I want to fish for like mahi mahi or tuna. read more
If the fish is bigger than the crab, the crab will have to determine whether it is a type of fish that will eat it. There are many fish that consider a hard crab quite a prize. Mr. read more
Couple that with the viscous nature of the water brought about by higher pressure, etc, this isn't a bad way to think about it. But expand on it. To a crab, scuttling on the botton, small fish, flitting back and forth above him in flocks like birds are great. read more