What are the tails of phospholipids that don't like water?

The tails of phospholipids that don't like water are comprised of long hydrocarbon chains, typically fatty acids. These hydrophobic tails are nonpolar, meaning they do not interact favorably with water molecules. Instead, they repel water, which allows phospholipids to form bilayers in aqueous environments, with the hydrophilic (water-attracting) heads facing outward and the hydrophobic tails oriented inward. This unique structure is essential for the formation of cell membranes.