ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY
Beach warning flags. Flags being used at a beach to warn people of moderate surf/currents (yellow flag) and dangerous marine life (purple flag). The flags are being displayed at a lifeguard station. Dangerous marine wildlife usually means jellyfish and other poisonous animals. Photographed at Miami Beach, Florida, USA.
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