In Tibet, there is a tradition of so-called “sky burial”, where a corpse is cut open purposefully for the animals and birds to eat the flesh. This is a ritual which is based on understanding of spirituality by Buddhism, which Tibetans adhere to. Buddhism teaches rebirth in a way that there is no need to preserve the body, as it is an empty vessel after death. Birds may eat it, or nature may let it decompose. There is an article about this on Wikipedia and two disturbing pictures. There is also a blog post explaining the tradition here.