1. If the breeder feeds a single food for a long time, Biff will get tired of it and start to refuse to eat. Therefore, breeders should make a rich combination of food varieties.

2. When Biff's saw-tail hanger is sick and unwell, it will also refuse to eat. Breeders should often observe the growth state of Biff's saw-tail cranes, and conduct necessary physical examinations and treatments.

3. Biff saw tail cranes who have come to a new environment, because of their unfamiliarity and incompatibility with the environment, they will also have the phenomenon of not eating. When the Biff sawtail crane adapts to the new environment, it will resume eating.