From Creatures Wikia
Cuttlefish (Sushi hazardous)
A squid-like filter feeder, the salt water dwelling Cuttlefish is an eccentric critter that changes its color when it is threatened (for example, by a Rainbow Sharkling or amphibious Norn) or otherwise affected by mood.
At the beginning of the game, several cuttlefish are present in the left side of the Marine Terrarium.
Did you know?: if you put food on the beach at the right side of the aquarium, near the water, any cuttlefish you have in the right side of the room will start leaping!