乌鸦是一种杂食性鸟类,特别喜欢吃腐烂的动物尸体,并且其嗅觉特别灵敏,能在很远的距离嗅到尸体分解发出的微弱气味。病人临终前,由于机体新陈代谢发生严重障碍,导致部分组织细胞开始变性分解, Crow is a omnivorous bird, especially like to eat decayed animal carcasses, and its sense of smell is particularly sensitive, can smell the faint smell of decomposition of the body from a very long distance. Before the patient's death, due to serious obstacles in the metabolism of the body, resulting in some tissue cells began to degeneration,