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A US site with information on keeping chinchillas as pets.
A British site by a hamster breeder, covering all aspects of hamster care.
A British site about keeping Mongolian gerbils.
A British Society, primarily regarding showing rats, but also contains information on keeping rats as pets.
A British Society promoting gerbils as pets, giving details of all aspects of gerbil keeping.
Written by British rat breeders, with lots of advice on keeping rats.