Most CAA inspectors are only interested in the BCU paperwork and a quick view of whats happening in a 30/60 minute time slot. Occasionally you get one that has come from an airfield ops background and has some knowledge but not that many in my experience. Having said that, I don't see that it is necessary for the job they are doing for them to have an extensive ornithological knowledge to carry out the inspection.
Lots of people think they know a lot about bird control on airfields and think it's easy, but, we know better eh??