Banham Zoo.
Just 'up the road' from Linton is another 'small' zoo- Banham in Norfolk- but this is actually a much bigger collection and its nicely set out too. Its owned by the same farmer who owns 'Africa Alive' in Suffolk (formerly the Suffolk Wildlife Park) but in my opinion Banham is the more interesting collection- though it lacks the large ungulates of Suffolk W.P.
I'm not going to list absolutely everything- you can look on Banham Zoo's website for that, but they do have(or have had) such species as; Snow Leopards, Sri Lankan Leopards, Cheetah, Siberian Tiger, Grevy Zebra, Camels, Pudu, Maned Wolf, Binturong, Fur Seal, Muellers Gibbon, large collection of South American monkeys, marmosets and tamarins, Colobus, Lemurs etc, Red Panda, Otters, deer/llamas-a good bird collection including a very comprehensive collection of Amazon Parrots, a falconry centre, rare breeds farm etc.
Its also laid out in an attractive setting, with trees and hedges and with animal exhibits seemingly around every corner and with some good modern enclosures. For families with children, its a relatively small area easy to get around but there's even a little train as well in case you get tired.
Banham certainly gets my vote on several levels and is worth a visit.... my only grouse?- they let their small group of precious Hamlyn's monkeys die out...