I like that tests for cognition are both getting "better" and also more diverse. It used to be focussed on really crude things like mirror-self recognition, or attempts to bridge the speech gap.<p>Now, it seems to me to be more accepting that things like implied lying, or if-this-then-that conditional logic, or evidence of introspection or altruism (refusal to accept higher grade outcomes than the peer-set beyond some limit, sharing) are being done, with good grounding (not clever-hans prompted/learned behaviour, proper double-blind science)<p>Magpies (Australian members of the corvid group, not European Magpies) appear to hold courts and punish misbehaviour. I believe dolphins do similar things. And, their interaction with humans can go beyond "you feed me" to include play, and what seems to be genuine interest in the world beyond the water.<p>Play is (I think) an underrated measure of intelligence. It implies having judgement of the work-life balance (for an animal, finding food would be work surely)