The date the common sea snail arrived in North America is still open to debate.

Researchers have renewed a century-old debate over whether the common periwinkle, a sea snail that has reshaped the ecology of much of the east coast of North America, was imported from Europe by humans.

Read the story here.

The date the common sea snail arrived in North America is still open to debate.

Researchers have renewed a century-old debate over whether the common periwinkle, a sea snail that has reshaped the ecology of much of the east coast of North America, was imported from Europe by humans.

Read the story here.