Here are some categories of pets that are relatively inexpensive to keep and generally require less space and maintenance:
1. Hamster: small, cute, lively and active, does not take up much space, and has low food cost.
2. Fish: Goldfish, koi, etc. are economical and they basically only need to provide water and food.
3. Ferrets: Although the initial investment is higher, the cost of food and entertainment for ferrets is much lower than that of dogs or cats.
4. Rabbit: Medium size, docile personality, easy to train, and low food cost.
5. Frogs: Frogs are very cheap to keep and they don’t require much space to live in an aquarium.
6. Spiders: While they may not be suitable for everyone, spiders are cheap to raise and simply require providing them with a safe container and food.
7. Rats: Rats make great pets. They are kind, docile, and easier to care for than some other pets.
8. Plasma Ball: This is a less common pet, but they don’t require a lot of space and their food costs are low.
9. Geckos: Geckos are very cheap to raise and they can live in a relatively small space for a long time.
10. Snakes: Compared to other animals, snakes have lower food costs and entertainment costs. But please note that if you have never owned a snake or do not understand a snake's behavior and needs, it is best not to try it casually.
Overall, these pet categories generally require less investment and are relatively easy to care for. But no matter which pet you choose, you should first understand its characteristics before raising it to ensure that you are willing and able to bear the time, energy and financial costs required to raise them.
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