This is designed by Alfredo Giunta. The diagrams are found here: http://ori500.free.fr/diagrams/local_pdf/Sparrow%20%28Alfredo%20Giunta%29.pdf
Before, I am more of an origami artist who makes geometric forms more than animals. Now, I decided to try animals more.
You have to be very careful in making this model, since there are steps that can rip the model if you do not "watch out."
I appreciate the design of this model since Giunta have exerted much effort into putting detail onto the butterfly. He even put detail on the insect itself. The models I have seen for now only beautify the wings. Im pretty sure, though, that there are also other models like this (like LaFosse's works).
I advise that you do not use thick paper. There are parts where paper can be very hard to fold if you use thick paper (like the head).