Read the following text to answer questions number 25 to 28.

    An animal nursery is a kind of job. People who work as animal nursery workers work in zoos, kennels, animal shelters, and circuses. They are responsible for feeding, watering, cleaning, bathing and exercising animals. They care for animals' health by disinfecting them and keeping their cage clean. They keep records of treatments that the animals have received from the veterinarian, an animal doctor.

    Animal nursery workers have serious responsibilities and functions. They provide care for newborns and young animals, prepare their food, transport them to feeding areas, and deliver food and water to them. The food they prepare is different for each species of animals they care for. They fill nursing bottles which have been sterilized with the appropriate feeding formula. They also take care of orphaned animals. They observe newborn animals and check for signs of disease or abnormality. They may perform physical exam on the young animals occasionally, taking their temperatures, pulse rate and blood pressure. They are also in charge of cleaning and preparing comfortable sleeping areas for animals, removing waste, cleaning and disinfecting them. They also make sure all cages and enclosures are safe.

The food that the animal nursery workers prepared depends on ____.