To me, the "will they mess with other animals for giggles" and "do they recognize other intelligent animals" are the barrier for entry into the "intelligence" c

To me, the "will they mess with other animals for giggles" and "do they recognize other intelligent animals" are the barrier for entry into the "intelligence" consideration. Dolphins (including orca) do, primates do, the article says crows do. Cats and dogs do too.