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So, specifically for the bird part, they show the process of tracing the drawing onto a card, paining one half, then folding it in the video labled vol. 11 on KyoAni's youtube channel. I can't read japanese, but there is on screen text that might say who animated it.
https://m.youtube.com/watch?v=-nMXdt9Ytwc&index=27&list=PLTNhweghpLi2r7hi145BvpxZI-HiSk1HV&t=0s