During the time of creation particular species of animals (rare: plants) exchanged certain organs or traits or one animal borrowed an organ from another one but never brought it back. Thence the characteristics of these animals now. In rare cases the back exchange and restoring of the initial situation or the passing of certain organ from one animal to another without compensation are described
God, animal, some person warns one of the people about the catastrophy (usuallly the flood) that will become soon and in which most of the people must perish
Magic person reveals his true nature and/or remains with the real people after the object responsible for preserving the non-human appearance (usually an animal skin) is destroyed (usually burned)
A man fells trees to clear ground for a garden or breaks ground. Certain person or animal revives vegetation, makes the soil virgin again. He or she explains that the flood is coming, there is no sense to work and advices to prepare a floating device
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
Supernatural woman comes to live with humans. Thanks to that, food becomes easily available. She is maltreated, goes away, temporal superfertility is lost forever