Ungulates
Please note that I have not included domestic species.
Both: South-east Asian elephant;
Grevy’s zebra; greater one-horned rhinoceros; Negros warty pig; southern pudu Kirk’s dik-dik; eastern bongo;
Chester
Onager
Malayan and Brazilian tapirs
Eastern black rhinoceros
Red river hog; common warthog; Sulawesi babirusa
Balabac chevotrain
Okapi; Rothschild’s giraffe
Indian muntjac; Myanmar thamin; Visayan spotted deer
Lowland anoa; Javan banteng; red buffalo; western sitatunga; roan antelope; red duiker
Planckendal
Przewalkskis horse; Hartmanns mountain zebra
Chacoan peccary
Guanaco; vicuna
Kordofan giraffe
Reeves muntjac; Rocky Mountain wapiti
Slender-horned gazelle; Plains and European bison; Arabian and scimitar-horned oryxes; addax; common impala
Chester has tapirs and a chevotrain and more species of rhinos, pigs, giraffids and deer. Planckendael has camelids, a peccary and more species of equids and bovids. Chester wins.
Birds
Both: Humboldt penguins; little egret; Hamerkop; Eurasian spoonbill; waldrapp; Chilean flamingo; white-faced whistling and white-winged ducks; Eurasian black vulture; Palawan peacock and Salvadori’s pheasants; Malaysian great argus; crested wood and white-necklaced partridges; Himalayan monal; eastern grey-crowned and western black-crowned cranes; emerald dove; green-naped pheasant-pigeon; Nicobar and pied imperial pigeons; Luzon bleeding-heart; spectacled owl; Fischer’s turaco; wrinkled hornbills; red-whiskered bulbul; chestnut-backed ground thrush; red-tailed laughing thrush; Asian azure-winged magpie; Bali mynah; red-billed leiothrix; white-rumped shama; golden-breasted and scissor-billed starlings
Chester
Southern cassowary
Black stork
Caribbean flamingo
African white-backed, Old World comb, white-headed and ferruginous ducks; Cape, marbled, red-billed and Hottentot teals; garganey; Baer’s, tufted and red-crested pochards; ruddy shelduck; red-breasted goose
Bronze-tailed peacock, Lady Amherst’s, Vietnamese and Edward’s pheasants; Cabot’s and Temminck’s tragopans; chestnut-bellied hill partridge; Congo peafowl; eastern crested guineafowl; red-billed curassow
Sunbittern; wattled crane
Blacksmith lapwing
Black-naped and superb fruit, cinnamon ground and Socorro doves; Mindanao bleeding-heart; Victoria crowned, pink and rock pigeons; white-naped pheasant pigeon
Blue-crowned hanging parrot; blue-throated macaw; coconut and Mindanao lorikeets; hyacinth macaw; golden conure; grey-breasted and Lord Derby’s parakeets; lesser sulphur-crested and Philippine cockatoos; lilacine amazon; yellow-backed chattering lory
Brown wood, northern white-faced and Philippine scops, Ural and Eurasian great grey owls
Collared trogon
Red-crested, violet, white-crested and Schalow’s turacos
Javan rhinoceros, Mindanao wrinkled, Visayan taricticken’c, Von der Decken’s and great hornbills; lilac-breasted roller
Black-browed, fire-tufted and brown-breasted barbets; green aracari
Red avadavat; yellow-crowned bishop; grey-winged blackbird; Asian fairy bluebird; scaly-breasted bulbul; red-crowned and yellow cardinals; Timor zebra finch; South African firefinch; Madagascar fody; collared grosbeak; white-throated orange-shouldered ground thrush; inca jay; blue-crowned, Sumatran, Sunda and spotted laughing thrushes; Emei Shan liocichla; oriental magpie robin; Indian red-billed and Javan green magpies; silver-eared mesia; yellow-faced myna; black-naped and Montserrat orioles; snowy-crowned robin-chat; Javaand Timor sparrows; Asian and superb glossy, red-winged and emerald starlings; Brazilian and Passerini’s tanagers; West African green-backed twinspot; common, orange-cheeked, zebra and lavender waxbills; black-necked and western village weavers; Kilimanjaro white-eye
Planckendael
Common ostrich; lesser rhea; common emu
Dalmatian and great white pelicans
African spoonbill; oriental white stork; black-crowned night, white-faced, purple and green-backed herons; rn cattle egret; westblack-faced, glossy, sacred, scarlet, straw-necked and black-headed ibises
Lesser flamingo
Berneier’s, red-shouldered and chestnut teals; black-bellied whistling and Magellanic steamer ducks; black-necked swan
Common black and red kites; Harris’ hawk; Western Egyptian and western Eurasian griffon vultures; secretary bird; crested caracara
Asian blue quail; brown-eared, golden, Siamese fireback and Cheer pheasants; Cocjin-chinese red jungle fowl; green and Indian peafowl; helmeted and vulturine guineafowls; crested and great curassows
African purple swamphen; blue, red-crowned and demoiselle cranes; grey-winged trumpeter
Black-necked stilt; pied avocet; inca tern; bush thick-knee; masked and southern lapwings
Speckled pigeon; zebra dove
Common barn, Eurasian northern hawk, short-eared and Eurasian long-eared owls
Tawny frogmouth
Mexican green military and scarlet macaws; olive-headed and rainbow lorikeets; sun conure
Guira cuckoo
Emin’s and great blue turacos
Collared kingfisher
Common bronzewing; red-billed chough; red-billed blue magpie; chestnut munia; bank and greater hill mynahs; Brahminy and white-shouldered starlings; village weaver
Both zoos have their strengths and weaknesses as regards different types of birth, but Chester tends to have a better collection, especially as regards perching birds.
Chester wins this one, but Planckendael has a better collection of birds than I thought it would.