A decade ago, I stood on the muddy banks of the Great Marsh, a salt marsh an hour north of Boston, and pulled a thumb-sized crab with an absurdly large claw out of a burrow. I was looking at a fiddler ...

A fiddler crab is a crab species from the genus Uca. They are native to brackish environments, which are made of part freshwater and part saltwater, all over the world. Fiddler crabs get their name ...

Dr. David Johnson, an ecologist at William & Mary's Virginia Institute of Marine Science, has spent more than 20 years in salt marshes, at sites all along the U.S. East and Gulf coasts. But while ...

A parade of mangroves and now, crabs, are heading north. Atlantic mangrove fiddler crabs have been found nearly 200 miles further from their historic northern limit in Jacksonville, Fla., according to ...

The crabs are part of a larger poleward migration of tropical species driven by warming ocean temperatures. While associated with mangroves, the crabs have expanded beyond the trees' new range into ...