yes a fish shouldn't be a problem... it sits on your desk,
I have a friend who has a beta (or siamese fighting fish) thats been alive over 2 years now..
mine lasted 6 months until I gave it to a friend to watch and it died in her care.
betas have personality too! I don't know about a hamster though, or a bird.. but
you rebellious college types will get creative, rules (like this) are made to be broken.
ha ha ha