The Animalarium at Borth near Aberystwyth is something of an eco-zoo. The enclosures are made out of wood rather than steel and concrete and many of the animals are former pets which had been abandoned. Having said that it is still a zoo and the animals are kept in cages.
Most of the animals are small including lots of little monkeys and there are a lot of reptiles as well although there are leopards, crocodiles and ocelots if you want something a bit more carnivorous.
The downside for me was the cost of admission which I felt was way too high given the size of the zoo. On the plus side you could buy tubs of nuts and grapes to feed to the monkeys which my daughter really enjoyed. It's probably worth a look if you've got some cash to spare.
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