In an ecological context, a tertiary consumer is an animal that eats secondary consumers. Typically, this would be a carnivorous animal that sits at the top of the food chain.
Among the options given:
- The mouse and rabbit are usually primary consumers (herbivores).
- The jackal is typically a secondary consumer as it can eat primary consumers like mice or rabbits.
- The lion is considered a tertiary consumer as it can eat both primary and secondary consumers.
Thus, the correct answer is lion.