An animal glue is an adhesive that is created by prolonged boiling of animal connective tissue.
These protein colloid glues are formed through hydrolysis of the collagen from skins, bones, tendons, and other tissues, similar to gelatin. The word "collagen" itself derives from Greek κόλλα kolla, glue. These proteins form a molecular bond with the glued object.
Stereotypically, the animal in question is a horse, and horses that are put down are often said to have been "sent to the glue factory." However, other animals are also used, including rabbits and fish.
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Famous quotes containing the words animal and/or glue:
“Man, became man through work, who stepped out of the animal kingdom as transformer of the natural into the artificial, who became therefore the magician, man the creator of social reality, will always stay the great magician, will always be Prometheus bringing fire from heaven to earth, will always be Orpheus enthralling nature with his music. Not until humanity itself dies will art die.”
—Ernst Fischer (1899–1972)
“I was never one to patiently pick up broken fragments and glue them together again and tell myself that the mended whole was as good as new. What is broken is broken—and I’d rather remember it as it was at its best than mend it and see the broken places as long as I lived.... I wish I could care what you do or where you go, but I can’t. My dear, I don’t give a damn.”
—Margaret Mitchell (1900–1949)