Gorilla was first kept long-time in Breslau, currently Wroclaw from 1894, and first bred in 1956 in Columbus.
I am not sure who did eg:
- first free-flight aviary (Zurich? Montezuma zoo in pre-columbian Central America?)
- first nocturnal house
- first long-term keeping of cetacean in captivity (Harbour Porpoises some centuries ago?)
- first birth of a cetacean in captivity
- first smooth-curved aviary allowing birds of prey to fly inside (Rome?).
opening of London Zoo and Whipsnade were major milestones in zoo history
Whipsnade was perhaps remarkable as the first safari park, although I am not sure if worldwide.
London zoo is currently B- or C-class zoo and of limited interest outside England. It however should be remembered for:
- the first aquarium in a zoo,
- first reptile house,
- first insect house, although I am not sure if worldwide or in England.
And perhaps the only listed animal exhibit (Lubetkin penguin pool) for which nobody managed to find an animal fit to live inside.
