I work at a school where we have a fenced-off pets' area. Pupils are able to keep rabbits, guinea-pigs, hamsters etc, as well as a few chickens. Recent additions have been two sheep and a pupil has this week introduced 4 Indian Runner ducks. One of my colleagues has raised a concern that ducks should not be kept with other poultry, as they harbour much more virulent diseases in their gut than chickens do, and he thinks there is a great danger of infection spreading to the human visitors to the pet area. The small pets are all contained in cages and runs, but the chickens and ducks free-range, although they are shut up in their own coops at night. The sheep, I am told, will be going soon. I would be grateful for any insight/advice from other members who have experience of what happens when you mix ducks with other poultry and what biosecurity measures should be introduced to minimise any possible risk to humans and the residents of our pets' corner.