According to the Florida Museum of Natural History, "the predatory Horse Conch can grow to 24 inches long," making it the largest gastropod in American waters. State Shell - Florida Department of ...

It's a conch shell that was found in a hunter-gatherer cave in southern France. The artefact is the oldest known wind instrument of its type. To date, only bone flutes can claim a deeper heritage.

Photograph shared on social media shows a "giant horse conch" discovered in the waters of the Gulf of Mexico.