Cockroach farming is a specific type of insect farming that involves the breeding of cockroaches as livestock in controlled facilities. Such farming is a sizable industry in China, where large buildings are home to millions of insects. They can be raised as a food source for humans, as feed for non-human animals such as lizards, or sold to the pharmaceutical industry for use in medicine. The cockroaches are often killed in vats of boiling water before being dried, and, depending on their purpose, they may be crushed, ready for processing. Prospective farmers are able to obtain how-to kits to begin their farming venture, while larger companies are able to produce billions of cockroaches every year.