The Evolution of Play in Octopuses

There's quite a bit out there now on play in octopuses. And another invertebrates and fish,. There's now been well documented and in lizards and crocodilians. Even in snakes, there might be some playful behavior - although it's harder to identify an animal that can't do too much in terms of facial expressions or limbs. It also means that play is not a homologous kind of activity, something that evolved once in one way and that was it.