Birds, fish, reptiles, mammals intentionally or by chance are smeared with colorful substances or divide among themselves parts of somebody's body thus acquiring their present characteristics
Originally, humans had (had to have; can have under some special confition) their genitals not on the place where they are now; the genitals were absent, or people did not know know their function and used for copulation other parts of the body
The alive person comes to the land of the dead after somebody’s death
The alive person comes to the land of the dead to bring back somebody who has recently died (besides stories about shamans who journey to the other world to bring back the soul of a sick person) or, having no particular aim, goes there in company of somebody who had recently died or following his or her tracks