Do penguins have powerful pectoral muscles?

Penguins do have well-developed pectoral muscles, which are crucial for their swimming abilities. These muscles enable them to use their flippers effectively to propel themselves through water, much like how birds use wings for flying. However, compared to flying birds, penguins' pectoral muscles are adapted for endurance and power in a submerged environment rather than for flight. This adaptation allows them to navigate and hunt efficiently underwater.