There will be three kinds of animals on Mars.

• There will be eco-system animals. They are animals needed as part of the colony eco-system.

• There will be production animals. They are part of the food production.
  • Fish, for human consumption.
    • Other than plant waste, they could also consume waste products from the mammal production, and insects.
  • Mammals, for human consumption. May not be the primary use of them. They could be primarily recreational animals.
    • They should be able to eat park-plants, and plant waste.
  • Insects, for human and animal consumption.

• Recreational animals.
  • Pets
  • Inhabitants of a park. Some of them may have practical applications, but all of them should probably have a high cuteness-score, and be colorful.
  • The first zoo on Mars