A purple flag at the beach signals dangerous marine life—an often-ignored warning that could protect you from serious harm in the water

Injuries occur when people accidentally step on them.

Their defensive barb can cause deep, painful wounds that may require medical care.

• SEA URCHINS

Sea urchins are typically found near rocks or reefs.

Stepping on one can leave painful spines embedded in the skin.

THE BIGGEST MISUNDERSTANDINGS ABOUT PURPLE FLAGS

Many beachgoers continue reading …