These biting clam worms swarmed a harbor in Charleston, South Carolina

These marine worms, commonly referred to as clam worms, swarm coastal waters in Charleston, South Carolina on April 14. Though usually found on sea floors, these worms come to the surface for a massive mating ritual each year, signifying the start of spring in the area.

Clam worms, a type of marine worm, are seen swarming the waters of a Charleston, South Carolina harbor earlier in April, part of an annual mating ritual.

These marine animals, commonly referred to as clam worms, are known to swarm coastal waters during the spring during an annual mating ritual. Typically no more than 1 inch long, these clam worms were found in a harbor in Charleston, South Carolina earlier in April.