An invention is generally a word used to imply the creation of something new. Like invention of the light bulb. :)
The word for this would be study, or research. Because the authors were trying to understand this aspect of the animal that they observed.
Cheers. Now I understand where you were coming from! I was confused!
Researchers find this direction of the animal and get invented, my first job is to write to you my friend..I promise! :)))) @justtryme90