Older giraffes are very conservative beings and hate to enter new spaces, especially narrow corridors and walking under a bridge.
In 2001, Prague built their current giraffe house and new outdoor pen, and moved its giraffe herd from the old house (its space today is used by elephants). The herd consisted of 10 cows (including highly pregnant) and calves and the breeding bull Šimon who was at that time already 16 or 17 years old. The move itself was long planned, time consuming but smooth. Combined team of Prague and Dvur Kralove giraffe keepers and vets moved all animals without any injuries to anybody.
However, bull Šimon spent the rest of his life (he died 23 years old) only inside the house and on the hard standing, never entering the large 5 ha grassy paddoc. He simply refused to enter the narrow corridor leading to it. His keepers tried everything imaginable over the years, using also advices coming from other zoos - to no awail. Nothing could change his mind, no treat, cow in heat or threatening noise. When they were desperate, they even used farm tractor with mounted flat board to simply push him through the corridor by brute force. Nothing helped.
I remmember one warm late summer afternoon, either 2001 or 2002, I was standing on the bridge at giraffe house and by chance Mr. Veselovský (retired Prague zoo director serving 1959-1988) stopped just near me and started to explain to the person he was with, how wrong the chosen design of the new giraffe enclosure is. He explained how conservative giraffes are, what they dislike and fear. And called the new zoo director very ugly names and not only due to the giraffe house.