Why Nature Keeps Turning Into Crabs

Evolution has a strange obsession with reinventing the crab. Throughout history, many unrelated creatures have independently evolved into a crab-like shape because this sturdy, compact design is incredibly effective.

Scientists call this phenomenon carcinisation, and it is a classic example of convergent evolution. It turns out that having a wide, flat shell and tucked-under tail is a winning strategy for survival in the ocean. This has happened so many times that biologists joke nature is constantly trying to perfect the crab design. It serves as a powerful reminder that evolution often finds the same clever solution over and over again.