What are you gonna use for a tanning solution? A lot of indians boiled the brain to an oil. They say each animals brain will generally produce the right amount of oil. I have never done it, but I have a friend that does and his hides are great. They also say they will age and preserve better than hides done with modern chemical processes
An old man told me once that all animals have enough brains to tan their own hides except for chikens and teenagers LOL!