A strange sight washed up onto a beach in Point Loma.
Kellogg's Beach hosted a beach invasion of a different sort Monday morning.
“Wow!” exclaimed Barbara Fletcher.
Fletcher and co-worker Bill Marsh walk the beach a lot.
“This is unusual. I’ve never seen them here before,” said Marsh.
The creatures they spotted are red or tuna crabs, typically found in warmer waters off Baja.
But on Monday morning, hundreds washed up onto the beach.
“I've seen these before,” said Fletcher.
So have we.
Back in June, 10News reported on sandy stretches of Ocean Beach and La Jolla, covered in red.
Thousands of red crabs are attracted by warmer waters.
Some experts have pointed to the “Blob,” an area including waters off California and Mexico five to six degrees warmer than normal caused by a persistent ridge of high pressure.
El Niño is another possibility. If El Niño is the main cause, these type of sightings could soon disappear, with El Niño waning.
Over the past few years, the crab swarms have also been spotted in Mission Beach, Tijuana and Newport Beach.