Apparently that's common behavior for all fish, not just octopuses. Here are 2 fish, each borrowing their own tunnel, and each spitting on each other, trying to

Apparently that's common behavior for all fish, not just octopuses. Here are 2 fish, each borrowing their own tunnel, and each spitting on each other, trying to block opponent's tunnel: https://m.youtube.com/watch?v=3O4sYndUdsI https://m.youtube.com/watch?v=3O4sYndUdsI