Where is the custom of letting birds take people away when someone dies?

Celestial burial is a common burial custom of Tibetans, also known as "bird burial". Used for ordinary farmers and herdsmen and ordinary people. Tibetan Buddhists believe that celestial burial is a wish to ascend to heaven. There are celestial burial sites in every region, that is, celestial burial sites, and there are specialized personnel (celestial burial masters) engaged in this industry. After death, people curl up, bow their heads and kneel down to form a sitting posture, wrap it in a white quilt, put it on the earthen platform on the right side behind the door, and ask the Lama to recite the sutra of crossing over. On an auspicious day, the undertaker carried the body to the celestial burial platform, first lit the "mulberry" smoke to the vultures, and after the Lama finished chanting, the celestial burial master disposed of the body. Then, vultures flew in, scrambling to peck, and eating them all was the most auspicious, indicating that the deceased was innocent and his soul had ascended to heaven safely. If you haven't finished eating, the rest should be picked up and incinerated, and at the same time, you should read it. Tibetans believe that vultures on the mountains around the celestial burial platform do not harm any small animals except eating corpses, so they are "god birds". Celestial burial ceremonies are usually held in the early morning. Before dawn, the family of the deceased will send the body to the celestial burial platform. The sun rose slowly and the celestial burial ceremony began. You'd better not read it without permission.