ZSL London Zoo
African Jacana (Actophilornis africanus) - only UK-holding of this species.
You're right about Crested Guan.Is Birdworld the only public collection to have Australian magpie and crested guan on display?
Is Birdworld the only public collection to have Australian magpie and crested guan on display?
It is also the only one with white woodpecker and I believe the only public collection in the UK with any woodpecker species.
Chester is also the only UK zoo - and one of the very few in Europe - to hold the Red-&-blue Lory (Eos histrio). Trouble is, I think they're off-show [maybe someone can confirm?].
Wingham is the only UK collection with Black-winged Lory (Eos cyanogenia); a species that's become very rare in aviculture. I think they only have a single specimen.
Paradise Park (Hayle) is the only UK holder of another rare lory: the Rajah Lory (Chalcopsitta atra insignis), a very distinctive subspecies of the Black Lory held only at Hayle and Loro Parque (though as with many psittacines, you'll find more in private hands than in zoos).
... I'm sure there's a few odd birds at lotherton just cant think of them off the top of my head.
The curassow is also kept at Living Rainforest and Hamerton.
Recent news - Paignton is the only UK holder of Lesser Adjutant Storks.