In the article that I have read they did tests with octopus’s. the tests was to see how long they would play with a cretin toy. They would either play with a plastic cow with rings connected to it, a plastic colored pliers, and ball of interlocked rings.
The scientists’ put two octopuses’, a male and a female, in a fiberglass tanks that was 1.3 X 1.3 m with water 1 m deep. Each of the three was presented nine times, once in the morning and twice in the afternoon at least two hours apart. They recorded the time that the octopuses’ fiddled with them.
The thing that I liked the most about this article was that they had octopuses’ play with the toys that they set out. Even though the cow was fiddled with for the longest time, What if the added a different toy in the scenario?