Why do penguins wings become so feeble?

Penguin wings have evolved to become shorter and more rigid compared to those of flying birds, adapting them for swimming rather than flight. This specialization allows penguins to maneuver efficiently underwater, using their wings like flippers to propel themselves. The loss of flight capability is a trade-off for their ability to thrive in aquatic environments, where they hunt for fish and other marine prey. As a result, their wings are less developed and appear feeble compared to those of birds that fly.