Final answer:
Phosphatidylcholine is the most abundant phospholipid found in animal cell membranes, contributing to structural integrity and membrane fluidity.
Step-by-step explanation:
The most abundant phospholipid in animal cell membranes is phosphatidylcholine. This phospholipid is a major component of cellular membranes and consists of a glycerol backbone, two fatty acids, a phosphate group, and a choline. Phosphatidylcholine is crucial for the structural integrity of cell membranes and plays a pivotal role in membrane fluidity and function.