Cape Cod officials are reminding visitors how to stay safe as great white sharks begin their annual return to the tourist destination.
The Cape Cod National Seashore said in an advisory this week that visitors should swim close to shore, where their feet can touch bottom.
They should also swim in groups, avoid swimming alone at dawn or dusk, limit splashing, not wear shiny jewelry and not swim near seals, which are prey for sharks.
Cape Cod National Seashore Superintendent George Price notes sharks are spending more time in Cape Cod waters because the seal population is booming.
He says the great whites rarely bite humans, though there was an incident in Truro in 2012.
North Carolina has also seen a spate of shark attacks recently, including one that injured a visiting Massachusetts man.