Cookie, a Major Mitchell's cockatoo, had been part of the zoo's collection since the opening in 1934. He was given to Brookfield Zoo when he was one year old and was recognized as the oldest known member of his species in captivity[17][18] as well as the oldest living parrot at the time[19] and one of the longest-lived birds on record.[20] He is now deceased, having been euthanized due to a sharp decline in health on August 27, 2016, at 83 years of age.[21]