I think they are surprisingly bright, mine has brilliant recall of where things are from last time he saw them. He can work out how to open things, like the playhouse gate to go back in. He knows his name and when he has been naughty....as just a few examples. However, I think they are just like people, they get 'brighter' with more life experiences and education....so a well stimulated rabbit with lots of opportunities for exercises and exploring etc. can do more 'intellectually' than a rabbit who spends stacks of time just sat in a hutch.