I'd like to know how successfully the Kestrels co-existed with Emerald Doves and Spreo Starlings.........
That's amazing; I would worry about them sitting up high, not getting enough shelter from the elements AND eating the other birds.
The Snowdon Avairy has always had a problem with wild sparrows, starlings and rodent- pests, on my last visit it was absolutely rife with rats!
That is interesting, perhaps I should add it to my 'Rats in Zoos' thread.My guess would be the Rats are there because a. there is a good food supply and b. its close to the Canal- they like areas close to slow-moving or stagnant water. I have seen them by the Bridge over the Ornamental Waterfowl section of the Regents Park Lake too.
I think most UK zoos are affected to some degree.