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Mud Fiddler Crab
ExploreInvertebrate
Mud Fiddler Crab
minuca pugnax
The Mud Fiddler Crab is a small, colorful crab that loves to dance in the mud! With its big claw, it waves hello to other crabs and catches yummy snacks.
Habitat: They live in coastal marshes and muddy shorelines.
Appearance
The Mud Fiddler Crab has a square-shaped body, typically olive-brown to dark gray, with large, stalked eyes. Males are easily identified by one oversized, brightly colored claw, much larger than the other smaller feeding claw. Its carapace can sometimes show faint patterns or spots.
KingdomAnimaliaPhylumArthropodaClassMalacostracaOrderDecapodaFamilyOcypodidaeGenusMinuca
Category
InvertebrateRarity
Common
Danger
1/5 · Very low
Snaps
4
Interesting facts
Fiddler crabs get their name because males look like they're playing a fiddle.
Hundreds of tiny male fiddler crabs can wave their giant claws all at once!
If a male loses its big claw, the other small claw grows huge to replace it!
They can "hold their breath" by trapping water in their gill chambers!
Special abilities
Ability
Claw Waving Communicator
Mud Fiddler Crab can wave its enormous claw to signal to other crabs, attracting mates and warning off rivals with impressive displays.
Ability
Burrow Architect
Mud Fiddler Crab can dig intricate burrows deep into the mud, providing a safe home from predators and scorching sun.
Ability
Eye Retraction Shield
Mud Fiddler Crab has long eyestalks that can quickly retract into grooves, protecting its vision from danger and debris.
Ability
Mud Filterer
Mud Fiddler Crab can skillfully scoop mud with its small claw, filtering out tiny bits of food with specialized mouthparts.
Measurements & details
- Length
- 2 cm
- Weight
- 7 g
- Lifespan
- 2 years
- Number Of Legs
- 10
Diet & Feeding
They are nature's tiny clean-up crew, eating microscopic bits of food from the mud.
Primary Foods
- algae
- diatoms
- detritus
- bacteria
- small organic particles
Foraging Method
- Foraging
Ecological connections
eaten by
Great Blue Heron
Ardea herodias
A wading bird that preys on crabs.
eaten by
Mummichog
Fundulus heteroclitus
A small fish found in salt marshes.
eaten by
Raccoon
Procyon lotor
Mammals that forage for crabs at low tide.
shelters
Smooth Cordgrass
Spartina alterniflora
Crabs live among its roots for protection.
Traits
Social
Social animals live in organized groups, cooperating for survival benefits such as foraging, defense, and raising offspring.
Burrowing
Burrowing animals dig tunnels and chambers in the ground, using these subterranean structures for shelter, hunting, or breeding.
Colorful
Colorful describes organisms or objects displaying a wide range of bright and distinct colors.
Carnivorous
This trait identifies organisms whose diet consists entirely or primarily of animal tissue.
Marine
Marine habitats encompass all saltwater environments of the Earth's oceans, supporting an immense diversity of aquatic life.
Also known as
Fiddler CrabMud CrabPugnax Crab
Collections
Safety
Danger
1/5 · Very low
Be careful near the water, and don't touch the crabs without permission!
Frequently Asked Questions
How to identify Mud Fiddler Crab?
The easiest way to identify Mud Fiddler Crab is to use the Snappit nature identifier app.
How long is Mud Fiddler Crab?
2 cm
How much does Mud Fiddler Crab weigh?
7 g
How long does Mud Fiddler Crab live?
2 years
What does Mud Fiddler Crab eat?
They are nature's tiny clean-up crew, eating microscopic bits of food from the mud.
Where is Mud Fiddler Crab usually found?
They live in coastal marshes and muddy shorelines.
How does Mud Fiddler Crab hunt?
Foraging
How many legs does Mud Fiddler Crab have?
10
Snap Map
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Recent Snaps
Jun 2, 2026
Stone Harbor Bird Sanctuaryi
Photo attribution
(c) GobyHunter, some rights reserved (CC BY)
License: CC BY 4.0 ↗
Image may be shown cropped inside the card frame.
Where to spot
Park45 sightings50 species
Massachusetts, US
Wellfleet Bay Wildlife Sanctuary
You might spot Bearberry, Mud Fiddler Crab, and Pitch Pine.
View guide →
Park30 sightings12 species
US
Stone Harbor Bird Sanctuary
You might spot Atlantic Horseshoe Crab and American Oystercatcher.
View guide →
Park61 sightings7 species
Connecticut, US
Hammonasset Beach State Park
You might spot Rugosa Rose, American Herring Gull, and Osprey.
View guide →
