Who is the most dangerous animal at the zoo? Is it the zebra, the tortoise or the big cats? With keepers having to wear hard hats, ear protection and face visors around the birds, the rumour is that they are the most dangerous. Risky residents include the wattled crane, fish owl and lorikeet, but silverback gorilla Jurgen is unconvinced - until he has a ferocious run-in with Ivan the speckled pigeon, who really doesn't like being called tiny.