Making soap from animal fat?

Animal rights people need not answer…
Where I live, there is a species of seal that has to have it’s numbers culled. Currently, hunters tend to leave the fat to the sea birds, but I want to go back to the old practice of using it in soap. I don’t like the idea of having to kill the animals, but as they have to be killed, I don’t think anything should go to waste.
Anyone in Canada or Nordic countries remember this being done or have access to books or info about the saponifcation numbers for seal fat.. in specific, Storkobbe (Erignathus barbatus).
Again… I’m sorry for the gross-out, but I study ancient methods and they don’t always fit our modern sensibilities.