I agree with the description of operation of the cargo holds I still have a tech manual here somewhere and there is no way on gods green earth a bird of any size can cause the door to open. Sounds to me like the hydraulics were operated by the belly handle and the door was closed but not latched by the handle mechanism beside the cargo door itself..
Interestingly... why would the crew not have caught this during pre takeoff as the door unsafe light and lack of pressurization would have been a factor!?!?
