While researching native archery, I learned about making primitive arrows. One of the key materials needed is a natural glue made from birch bark, used to fasten the feathers and arrow tips to the shaft.
Here is the link to the YouTube video I watched, Otzi the iceman arrow part 1, how to make 5000 year old primitive archery hunting arrows: https://www.youtube.com/watch?v=EoNmUJWNCMw. At 2:45 it explains how to make birch tar.
Click the gallery photos below for captions.