Sheepdogs, hunting hounds, retrievers and guide dogs for the blind are among the best known, but other animals, such as monkeys, can be trained to aid the disabled. Search and rescue dogs help to find missing people, lost walkers and climbers, and earthquake victims. Less well-known human helpers include pigs used to find truffles (edible fungi) and cats kept by the British Post Office to prevent mice from eating the mail! Animals kept as pets also provide millions of people with championship.
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