Origami 小学2年生の折り紙

Giraffe

 

Demon

 

Goat

 

Rabbit

 

Shrimp

My son,8 years old,created these animals by using a sheet of paper.
He loves Origami every day with following book that his grandmother gave to him. 

I am 44 years old.
This book is too difficult for me to learn. 
I can not understand why my son can read this and create one after another!