Cuttlefish have ability to exert self-control, study finds

Delaying gratification may have evolved in the squid-like creature to maximise efficiency

Humans, chimps, parrots and crows have evolved to exert self-control, a trait linked to higher intelligence. Now, researchers say cuttlefish - chunky squid-like creatures with eight arms - also have the ability to delay gratification for a better reward.

Researchers used an adapted version of the Stanford marshmallow test, in which children were given the choice of scoffing an immediate reward (one marshmallow) or waiting to earn a delayed, but better, reward (two marshmallows), on six cuttlefish in an aquarium environment.