Atlantic Marsh Fiddler Crab
Minuca pugnax · Also known as: fiddler crab, Uca
Tiny marsh crabs that wave one oversized claw. NPS credits fiddler crabs with key roles in Assateague salt-marsh health.
Quick facts
| Group | Crab |
|---|---|
| Likelihood nearby | ★★★★★ |
| Habitats | Salt marsh, Coastal bays, Assateague State Park, Assateague National Seashore |
| Seasons (this coast) | spring, summer, fall |
How to recognize them
- Males: one huge “fiddle” claw and one small feeding claw; females have two small claws.
- Burrows honeycomb muddy marsh banks at low tide.
Biology notes
- Feed on detritus and algae on the mud surface; burrowing aerates marsh soils.
- Retreat into burrows as the tide rises or when shadows pass.
Where to see them around Ocean City
- Assateague salt-marsh banks at mid to low tide.
- Bay-side muddy edges reachable by kayak or boardwalk overlooks.
When to look
- Warm months on falling and low tides; winter crabs stay deep in burrows.
Viewing tips & etiquette
- Stand still—activity resumes once your shadow stops moving.
- Stay on firm edges; soft marsh mud can trap ankles and crush burrows.
