In this list, we've highlighted a few animals that have jobs ranging from the important to the unusual.
To safeguard the British prime minister's residence, 10 Downing Street, from mice and other rodents, a cat, known as the Chief Mouser to the Cabinet Office, is enlisted alongside security guards.
1. Chief mouser
Monkeys can be trained to assist individuals with mobility impairments, particularly those resulting from spinal cord injuries, by performing a range of daily tasks.
2. Monkey business
While dogs are traditionally recognised as guide animals, miniature horses are increasingly becoming popular in this role, offering a suitable alternative, particularly for individuals allergic to dogs, and with the added advantage of a longer potential working life.
3. Horsing around
Coal mines have long been dangerous places. Mine collapses are common, and carbon monoxide is a silent killer.
4. Canary in a coal mine
Dogs' impeccable sense of smell is well known, making canines ideal for locating bombs and drugs.
5. Dogs on the job
Next: Animals That Can See Better at Night Than You