Tiny brain: A sunfish weighing thousands of pounds has a brain only the size of a walnut.
No true tail: It lacks a real tail fin, making it a very slow swimmer that mostly drifts aimlessly with ocean currents.
Blank reactions: When bitten by predators, it often just floats without much reaction.
Low-nutrition diet: It spends its time eating jellyfish and gelatinous zooplankton, which provide almost no calories, meaning it must eat thousands of them.
