Dunno if this helps at all but my budgerigar, who I've named 'Paul the Octopus' 'cos of his eery divination chops, spent most of today nibbling the cuttlefish bone on which I'd written, in felt pen, "Mike Amesbury: who gives a toss?", and hardly touched the cuttlefish bone, wedged between the bars of his cage at a similar height, on which I'd written - also in felt pen - "Spen is wise and knows stuff".
Make of that what you will.