As requested in
this thread, here is a list of the British zoos with the largest collection of each taxonomic class (mammals, birds, reptiles, amphibians and fishes). All numbers come from Zootierliste.
Birds:
- Birdworld (Farnham) - 159
- Chester Zoo - 147
- Paradise Park (Hayle) - 129
- WWT Slimbridge Wetlands Centre - 117
- Cotswold Wildlife Park (Burford) - 107
- Birdland (Bourton-on-the-Water) - 106
Tropical Birdland (Desford) - 106
- Exmoor Zoo (Bratton Fleming) - 95
- Paignton Zoo - 89
- ZSL London Zoo - 87
- WWT Martin Mere Wetlands Centre - 85
Since this has already been done for the mammals, I decided to see how the birds shaped up.
Waterfowl: Slimbridge 93; Martin Mere 76; Cotswold 29; Exmoor 21; Chester 20; Paignton 15; Birdworld 14; Birdland 6; Tropical Birdland 5; Paradise 3; London 2
Parrots: Paradise 53; Tropical Birdland 49; Birdworld 28; Birdland 17; Exmoor 14; Paignton 12; Chester 11; London 9; Cotswold 5
Passerines: Chester 42; London 27; Paradise 24; Birdworld 22; Tropical Birdland 20; Cotswold & Birdland 13; Paignton 12; Exmoor 11; Slimbridge 1
Landfowl: Chester 19; Birdworld 13; Cotswold 10; Birdland 9; Paradise, Exmoor & Paignton 8; Tropical Birdland & London 5
Pigeons: Birdworld 19; Chester 16; Birdland 10; Paignton 9; Cotswold & London 7; Tropical Birdland & Exmoor 6; Paradise 4
Pelicaniformes: Exmoor 11; Cotswold 10; Birdland 9; Birdworld & Paignton 7; London 5; Chester 4; Slimbridge 3; Martin Mere 2; Paradise & Tropical Birdland 1
Owls: Birdworld 11; Birdland 7; Chester, Cotswold, Paignton & London 5; Exmoor 4; Paradise & Tropical Birdland 3
Shorebirds: Slimbridge 8; Birdworld 7; Cotswold & Birdland 5; Exmoor & Paignton 3; Chester, Paradise & Martin Mere 2; Tropical Birdland & London 1
Turacos: Birdworld & Paradise 8; Birdland 4; Exmoor & London 3; Chester & Tropical Birdland 2; Cotswold & Paignton 1
Bucerotiformes: Birdworld 7; Chester, Paradise & Tropical Birdland 4; Birdland & Exmoor 3; Cotswold, Paignton & London 2
Birds of Prey: Paradise 7; Chester & London 5; Cotswold 2; Birdworld, Tropical Birdland, Exmoor & Paignton 1
Flamingos: Slimbridge 5; Birdland 3; Birdworld, Chester, Tropical Birdland & Martin Mere 2; Paradise, Cotswold, Paignton & London 1
Gruiformes: Exmoor & Paignton 4; Chester, Slimbridge, Cotswold, Birdland & Martin Mere 3; Birdworld, Paradise & Tropical Birdland 2; London 1
Storks: Cotswold & Paignton 3; Birdland & London 2; Birdworld, Exmoor & Martin Mere 1
Coraciiformes: Birdland 3; Birdworld, Paradise & Exmoor 2; Chester, Cotswold, Tropical Birdland & London 1
Penguins: Birdland 3; Birdworld 2; Chester, Paradise, Cotswold & London 1
Ramphastides: Birdworld, Chester & Cotswold 2; Paradise, Birdland, Paignton & London 1
Falcons: Birdworld, Paradise & London 2; Cotswold & Birdland 1
Casuariiformes: Cotswold & Birdland 2; Birdworld, Chester, Tropical Birdland & Paignton 1
Frogmouths: Birdworld, Paradise, Cotswold, Birdland & Exmoor 1
Seriemas: Birdworld, Birdland, Paignton & London 1
Cuckoos: Cotswold, Birdland & Paignton 1
Ostriches: Cotswold, Paignton & London 1
Rheas: Birdworld, Birdland & Exmoor 1
Mousebirds: Chester & Paradise 1
Sunbittern: Chester & London 1
Tinamous: Chester & Birdland 1
Trogons: Chester & London 1
Bustards: Cotswold 1
Cormorants: Birdworld 1
Kiwis: Paignton 1
Naturally, the two wetland centres get the vast majority of their tally from waterfowl, but there's still definitely variants like with the mammals.