what PART OF THE HORSE IS USED IN MAKING GLUE?
Horses aren't the only animal used for making glue. Cows, fish, pigs, goats, sheep, and much more animals can be used to make glue. These animals have a protein called collagen. The Collagen is what makes stuff sticky and it can bond together wood and other hard surfaces. Collagen is found horses and there is a big supply of horses so it makes sense to use them. Collagen is found in cartilage, bones, hoofs, blood, hide, ect.