I have been to Five Sisters several times, including pre Xmas at the end of November. I have also done their photo days.
Bears will now be in Torpor until March.
The tropical house, has Caiman, West African Dwarf Crocodile, Monitor Lizard, Lorikeets, few snakes and lizards
Cranes, Meerkats and Otters are near entrance, as well as primate exhibits for Lemurs (walkthrough closed at present), spider monkeys, white-faced saki monkeys and a few other small primate, as well as Gibbons. There is also an old area of a sort of adventure castle which now has animals in (used to be entrance) which houses Kinkajou, Bats, Raven and Mice, like many nocturnal animals, not easy to see.
On the main walk round of the zoo, the exhibits are on the edge and in the middle is a fairground, not normally open this time of year.
Hard to see Reindeer in their exhibit, Tapir sometimes can be seen opposite.
Zoo has a number of species of cat and small carnivore, notably Lion, Clouded Leopard (not active usually during day), Cheetah (don't often see in paddock, but on the sand area), Snow Leopard (one on show, one off show, nice exhibit), Fishing Cat, Lynx, Rusty Spotted Cats, Red Panda (rarely see), Fossa, Scottish Wildcat, Badger (never see), Arctic Wolves and there may be something else forgotten.
Also small exhibits for Degu, and some other small rodents, as well as a farmyard, with various farm animals. Also a wallaby walkthrough, although again may be closed off in winter.
Not a lot of cover at zoo, so when you go on rainy day, you will get wet!
Cafe is outside the zoo, quite nice, but basic menu and pricey.
It's not over big and you can easily walk around the site in 60-90 minutes. I have found a number of animals certainly in my winter visit no shows, and that included 2/3 walk arounds.
Zoo is not huge, but not small, but definitely geared to families and that with all the rides and stuff around it. Exhibit sizes are decent enough, although a lot of the mesh makes it very hard to get good shots.
Even when I done a photo day the Clouded Leopards were no shows.
RSC, Clouded Leopards, Red Panda, Reindeer, Bears, Fishing Cat & Badgers, were all no shows when I went end of November and looking on social media posts, I would say that others say similar in winter.
Hope this helps.
Not a full inventory but would give you an idea of what you might see.