Do you have a child or grandchild who needs a quick school presentation? Then this is the article for you. Very short and filled with facts. 
 
"Koi and carp are very closely related fish types, yet they are sometimes considered as different types of the same species. However, there are important facts to consider about both Koi and carp before classifying them in the same group or into different groups. Hence, it would be highly interesting to know the characteristics and the differences between Koi and carp."  
 
https://www.differencebetween.com/difference-between-koi-and-vs-carp/