Cholesterol is commonly found in the cell membranes of warm-blooded animals because

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Cholesterol plays a crucial role in making the cell membrane more rigid and less permeable to certain molecules. This property of cholesterol is vital in maintaining cell membrane structure and function, especially at body temperature. Warm-blooded animals, which maintain a relatively constant internal temperature, need to have this property in their cell membranes. Excess dietary cholesterol is not stored in cell membranes and is regulated by the liver. Cholesterol is not directly involved in muscle contractions or movement.

Cholesterol Is Commonly Found in the Cell Membranes of Warm-Blooded