The salp exist because of phytoplankton blooms, which are their main food source, according to officials. The black dot in the center of them is their digestive system, and they are completely harmless.
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The critters are called sea salp and they're coming ashore on the Outer Banks. Kill Devil Hills Ocean Rescue posted pictures on Facebook to help people understand what is happening on their beach. The salp exist because of phytoplankton blooms, which are their main food source, according to officials.
They are also one of the creatures in which bioluminescence is very high. Therefore, if you see a glowing blue light on your Outer Banks vacation you're either witnessing bioluminescent plankton or you're about to meet an alien (prepare for a two finger handshake).