A shark washed up dead on a South Shore beach Thursday morning, while a great white shark was spotted 5 yards from the Cape Cod shoreline.

Shark researcher John Chisholm had received a report from fishermen about a thresher shark “acting odd” in very shallow water off Duxbury Beach Wednesday night.

“This morning it washed up dead,” Chisholm posted. “It was a 12′ mature male that was recovered for a necropsy. Michelle Passerotti (NOAA biologist) & crew will try to determine cause of death.”

Last night I had a report from some fishermen about a thresher shark acting odd in very shallow water off @DuxburyBeachRes. This morning it washed up dead. It was a 12’ mature male that was recovered for a necropsy. @shellspc & crew will try to determine cause of death. pic.twitter.com/EN0qLqYt3a

— MA Sharks (@MA_Sharks) August 1, 2024

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Meanwhile on Thursday, the Atlantic White Shark Conservancy’s Sharktivity app had reports of great white sharks close to shore along Chatham.

“White shark spotted 5 yards off of Monomoy Island headed south,” one shark report reads.

There were other reports of white sharks 25 yards and 40 yards offshore.

Chatham’s Monomoy Island is typically a very busy shark area during the summer and fall, as the apex predators hunt for seals.