This is a good question. Birds are fairly ubiquitous around the globe and could be a problem almost anywhere. Much more common than nuisance lizards, coyotes and those pesky nuisance mountain lions. 
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If you have shipping/receiving doors then you have the chance of birds getting in to a production facility (They can fly after all). In almost 20 yrs of food safety I have seen birds in several different facilities. I've even heard of a bird being inside a trailer and flying out once the trailer was locked to the dock-lock and the door was raised. I've audited many different food production facilities and from what I have seen, one would have to be naive to think that a bird could never ever get in.
Having said that, prevention is the definitely the best solution here. I recommend you contact a very reputable pest control provider for a quote on bird control. When they come to complete their inspection, walk with them, talk with them and soak up everything they say on bird prevention. You can decide what measures, if any, you want to implement.
Despite all of your best efforts, a bird still might get inside. If a bird does get into a facility, it could be useful to have a procedure that includes some or all of the following:
- information on how/who to contact (facilities pest control experts)
- instructions to raise mist nets if available
- if the bird is in a peripheral part of the building or in an attached DC, secure (lockout within firecode allowance) all doors into the main production area. Signage on the doors might help
- If the bird gets into the actual production area, you should have a plan. Do you want all production to stop? Do you have a way to cover the lines?
If you feel, as some previous posters do, that a bird is highly unlikely to gain access to your facility, perhaps you simply make sure that you have a general IPM procedure that says who to call in the event of an unwelcome/unusual pest. ie) bird, bat, mountain lion.
Regards,
Dan
