
The guinea pig is a domestic cavy, a rodent that is widely distributed in South America. In its native haunts, the cavy breeds only once a year, but the guinea pig begins to breed at the age of two months, and one female can produce a thousand offspring in a year. The babies are highly developed at birth and are able to feed themselves the day after they are born.
The goldfish has given way to tropical fish, of which there are many colorful varieties available at pet shops. The books on the care and feeding of tropical fish, which you can find at any pet shop or library, lay much stress on the importance of keeping the water at a rather warm and even temperature. This presents no problem, since thermostatic heaters are available. The live-breeders breed readily in captivity, but the egg-layers present a real challenge to the fish fancier.
People who breed animals for commercial purposes can sell almost any kind of animals that people like for pets. Among the animals for which there is a mass market are: chickens, geese, ducks, guinea hen, and rabbits for food; and mink and chinchilla for fur. There are several books in the libraries on raising various animals for fun and profit.
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