In reply to RockAngel:
Well, why are you interested?!
This is where you push your enthusiasms, interests balanced with practical aspirations.
You like birds? Are you committed to their conservation and communicating that enthusiasm to the public/membership? Do you feel your experience and interests make you the ideal candidate + the job will give you satisfaction/more experience in a field you want to make your career.
look at RSPB's objectives and repeat them back to them as your own
Don't be afraid to sell yourself!
ps I've filled ina few conservation job forms before now!