It is fed by a mechanical vulture so that it will not develop any abnormal affection for humans, which would be death sentence in the wild.
因為若不如此，禿鷹可能會與人發生情感，原始野性被「稀釋」，以後放回山林可能見了獵人也不怕，無異羊入虎口，徒讓研究人員白辛苦一場。