Using the same method I've used
here and
here, I took
Zootierliste's Top Holdings chart and filtered out the following:
- Anything without feathers
- Habitat birds in the game, as well as ones I have on my habitat wishlist(s), so this one doesn't end up being a subset of those (please don't get mad at me for no duck)
- Domesticated and breeding-forms
After this procedure, of the remaining feathered friends, I took the first 20 to conjure up a list:
- Blue-and-yellow macaw - 557 EAZA holdings
- (European) eagle-owl* - 502 EAZA holdings
- Snowy owl - 496 EAZA holdings
- Red-and-green macaw - 334 EAZA holdings
- Laughing kookaburra - 291 EAZA holdings
- (Eurasian) great gray-owl - 277 EAZA holdings
- (Congo) gray parrot** - 273 EAZA holdings
- Harris's hawk (no subspecific status)*** - 265 EAZA holdings
- (European) kestrel - 246 EAZA holdings
- Little owl (no subspecific status) - 242 EAZA holdings
- (Western) griffon vulture - 240 EAZA holdings
- Barn owl (no subspecific status) - 232 EAZA holdings
- Diamond dove - 218 EAZA holdings
- Rose-ringed parakeet (no subspecific status) - 218 EAZA holdings
- (North Eurasian) raven - 216 EAZA holdings
- Rosy-faced lovebird (no subspecific status) - 211 EAZA holdings
- Scarlet macaw - 210 EAZA holdings
- Cockatiel - 206 EAZA holdings
- Steppe eagle - 200 EAZA holdings
- Tawny owl (no subspecific status) - 195 EAZA holdings
*Since Zootierliste takes note of the subspecific status of animals in their top holdings chart and this thread probably prefers full species ranks, I've put common names for subspecies in parentheses. I couldn't ignore them entirely, since the figures are only for the aforementioned subspecies. When combined with others, holdings can increase quite a bit (e.g. Eurasian eagle-owl and gray parrot).
**Had to include common names for invalid or disputed (sub)species, due to limitations concerning the website's holdings stats as explained above (e.g. Congo gray parrot).
***When an entry has a "no subspecific status" note in parentheses, this means there are other subspecies defined on Zootierliste's system with separate holdings, so the total may actually be considerably higher (e.g. barn owl) than the figures specified on the list. Doesn't apply to entries without this note.
Sadly, there is no English version of this particular page, so you'd have to translate it using your browser or a third-party application if you don't speak German.
Edit: Fixed typo.