The ability of animals to identify their dead relatives occurred 400 million years ago, say researchers from Canada.
It is no secret that when animals and people die their bodies broadcast an unpleasant odor. Its aim is to discourage them from living. In experiments, however, scientists have discovered that absolutely all the carcasses of animals (crustaceans, insects, rodents, etc..) produce the same smell. This is due to a mixture of fatty acids, which are the key components oleic and linoleic acid.
Researchers suggest that animals have developed a system for recognition of death from 400 million years ago. Due to the broadcasting of corpses smell livestock avoid it because they may have died from disease.