Bees play by rolling wooden balls — apparently for fun. The cleaner wrasse fish appears to recognise its own visage in an underwater mirror. Octopuses seem to react to anaesthetic drugs and will avoid settings where they likely experienced past pain. All three of these discoveries came in the last five years — indications that the more scientists test animals, the more they find that many species may have inner lives and be sentient.
” Indeed, a surge of recent findings underpin the new declaration. Scientists are developing new cognition tests and trying pre-existing tests on a wider range of species, with some surprises. Take, for example, the mirror-mark test, which scientists sometimes use to see if an animal recognises itself. In a series of studies, the cleaner wrasse fish seemed to pass the test. The fish were placed in a tank with a covered mirror, to which they exhibited no unusual reaction.
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