People started understanding the world by making categories, and today's zoological system of knowledge has accumulated from thousands of years of people putting animals into categories. The ancients didn't have modem science and technology. Myths can be described as being the result of our predecessors 'attempts to sort out what they had experienced of beasts in their lives.
人對世界的認知由分類開始，今天人類的知識是經過幾千年對萬物加以分類後累積而成，古人不似今人有科學儀器、技術，神話可以說是先民觀察宇宙萬物各種現象後整理、分類而成。