This is a topic I'm very instrested in reasently. Mostly because I plan to buy a bird. Some experts belive lager parrots are on an intulectual level of a 3-5 year old child. african grays in perticualar have been shown to not only mimic human speech but comprehend and respond in an appoprate way.
As far as reptiles go I think reptiles like BD's and simalar one's IG's ect. do have personalitys and my even enjoy human contact to some degree. snakes however I have found to be more or less indiffrent. I dont know if I would say snakes have personalitys but they defently have indivual basic caritoristics.