Animal glues are adhesives made from the collagen found in animal tissues, particularly from bones, skin, and hooves. These natural glues have been used for centuries in various applications, including woodworking, bookbinding, and art restoration. They are known for their strong bonding properties and ability to dry clear. The production of animal glues involves boiling animal parts to extract collagen, which is then processed into a usable form. Common types include hide glue, fish glue, and casein glue. While synthetic adhesives have become more popular, animal glues are still valued for their eco-friendliness and reversibility in conservation work.