While animals can't be forced to do complex tasks like humans, many species have been trained to perform specific jobs or functions that benefit humans. Some examples include:

- Dogs for search and rescue, police work, or assisting people with disabilities

- Horses for transportation, farming, or recreational activities

- Elephants for logging in some countries

- Camels or llamas as pack animals

- Dolphins used by the military for detecting underwater mines

- Pigeons trained to carry messages during wars

- Ants used in some research labs for testing

- Bees for pollination of crops

However, there are ethical concerns about using animals for labor. Many animal welfare advocates argue we should use alternatives where possible and ensure any animal work is done humanely. Animals should not be forced into roles that cause suffering or go against their natural behaviors.

The key is balancing potential benefits to humans with the well-being and rights of the animals involved.