According to International Zoo Yearbook No. 30 (which refers to the year 1980), Melbourne Zoo in 1980 had 102 species of mammals. Now there's only 52?
Wow, that's a big drop in numbers!
Actually, now that I think, it must only be 51.
There's a few others that are permanently off-display or limited to the educational program only. But by my count, the number of species kept on display is 51, and that includes the fur seals that have spent what seems like an interminable period off-display whilst waiting for their new marine precinct.
My count (and a moderator may wish to split this into a new thread):
Primates
Orang-utan
Gorilla
Siamang
White-cheeked Gibbon (phase-out species)
Hamadryas Baboon
Mandrill
Black-and-white Colobus Monkey
De Brazza's Monkey (phase-out species)
Lion-tailed Macaque (phase-out species)
Ebony Langur (phase-out species)
Black-capped Capuchin
Black-handed Spider Monkey
Cotton-top Tamarin
Golden Lion Tamarin
Emperor Tamarin
Pygmy Marmoset
Ring-tailed Lemur
Black-and-white Ruffed Lemur
Carnivorans
Lion
Sumatran Tiger
Persion Leopard (phase-out species)
Snow Leopard
Puma
Serval
Caracal (phase-out species)
Fishing Cat
African Hunting Dog
Maned Wolf
Syrian Brown Bear (phase-out species)
Australian Fur Seal
Coati (single, 14yo left, importation planned)
Binturong
Asiatic Small-clawed Otter
Meerkat
Eurasian Badger (phase-out species which I've never, ever seen)
Ungulates
Giraffe
Plains Zebra
Bongo
Collared Peccary (phase-out species)
Other Placentals
Asian Elephant
Crested Porcupine (which I've seen once)
Red-rumped Agouti
Common Tree Shrew
Marsupials
Red Kangaroo
Kangaroo Island Kangaroo
Pademelon
Quokka
Goodfellow's Tree Kangaroo
Koala
Southern Hairy-nosed Wombat
Monotremes
Platypus
Short-beaked Echidna
All in all, it's a collection at a cross-roads.