What lipid protects lubricate and soften animal skin and hair?

The lipid that protects, lubricates, and softens animal skin and hair is sebum. Sebum is an oily substance produced by sebaceous glands in the skin, primarily composed of triglycerides, wax esters, and squalene. It helps maintain skin hydration, provides a barrier against environmental factors, and contributes to the overall health and appearance of hair and skin.