when dealing with wildlife its always best to do live traps when possible(spoken like a true zoologist!) You can use peanutbutter and seed mix for bait and place the bait in the attic. Check for a local wildlife center or government animal control, they sometimes loan out traps. If you cant get into the attic yourself check the phone book for "animal control" or "wildlife" listings, there are usually alot of companys that can take care of the problem. Keep in mind that the company should be licenced and bonded, check all that out too! (call local BBB before hiring anyone) Good Luck! :)