The etiological definition of a myth is this: a myth is the effort to describe earth characteristics, generally natural events, such as rain, a particular geographical characteristic or the behavior of humans.
An event is an explanatory tale. A number of ancient Greeks and Romans considered their myths to be allegorical accounts of natural events. There are tales about how the fox has received its fluffy tail, about how in the tales of Pecos Bill the Grand Channel was created and how the snake has lost its fingers. Like a person, the sky squirts his fluid seed (root) onto the earth, which subsequently carries kids (trees and crops), as a female could do (similar to a person, the sky squirts his fluid seed (root) into a ground.