Imagine you’re a big yellowfin tuna, miles from shore out in the blue, swimming around carefree, until you start to feel a little itch near your eye. Maybe it’s just a scratch that’s healing, or maybe it’s a tiny crustacean nibbling into your skin.
What do you do? You don’t have hands to pick it off. You don’t have cleaner wrasses nearby to carefully pluck it off for you like you might on a coral reef.
