Blue Crab
ExploreInvertebrate
Blue Crab
Callinectes sapidus
The Blue Crab is a colorful crustacean found in coastal waters. It has bright blue claws and a hard shell that protects it from predators. Blue Crabs are excellent swimmers and scavengers, helping keep the ocean clean.
Habitat: Coastal areas
Appearance
The Blue Crab has a distinctive greenish-blue to brownish shell, often wider than it is long, with prominent pointed spines on the sides. Its vibrant blue claws and legs, especially noticeable on males, set it apart. Females often have red-tipped claws.
KingdomAnimaliaPhylumArthropodaClassMalacostracaOrderDecapodaFamilyPortunidaeGenusCallinectes
Category
InvertebrateRarity
Common
Danger
2/5 · Low
Snaps
9
Interesting facts
A female blue crab can lay up to 2 million tiny eggs at one time!
Blue crabs drum their claws on the seabed to talk to other crabs!
Blue crabs regrow lost claws or legs when they shed their old shell!
Their amazing paddle-like back legs let them swim super fast, even backward!
Special abilities
Ability
Regenerative Power
Blue Crabs can regrow lost claws and legs after molting, which helps them survive attacks from predators.
Ability
Paddle Power
Blue Crabs have flattened, oar-like back legs, helping them swim quickly to escape danger or hunt prey.
Ability
Shell Chameleon
Blue Crabs' mottled shell helps them blend with the muddy seafloor, making it hard for predators to spot them.
Measurements & details
- Size
- 50-200 mm
- Lifespan
- 365-1095 days
- Leg Count
- 10
Diet & Feeding
These hungry crabs eat almost anything they can find, from tiny fish to plants!
Age differences: Younger crabs eat smaller prey, growing to consume a wider variety as they mature.
Primary Foods
- clams
- oysters
- small fish
- marine worms
- plants
- carrion
Foraging Methods
- Ambush
- Scavenging
- Foraging
Ecological connections
eaten by
Red Drum
Sciaenops ocellatus
Large fish like red drum hunt crabs.
eaten by
Raccoon
Procyon lotor
Raccoons often feast on crabs in shallow waters.
eats
Eastern Oyster
Crassostrea virginica
Crabs are important predators of oysters.
eaten by
Great Blue Heron
Ardea herodias
Herons stalk and eat crabs in coastal shallows.
Traits
Wildlife
Wildlife encompasses all undomesticated animal and plant life existing in their natural habitats.
Social
Social animals live in organized groups, cooperating for survival benefits such as foraging, defense, and raising offspring.
Omnivorous
This trait identifies organisms whose diet includes both plant and animal matter.
Scavenger
Scavengers consume dead organic matter, helping to decompose carcasses and other waste in the ecosystem.
Ancient Lineage
This trait signifies organisms belonging to a very old evolutionary group with ancestors dating back millions of years.
Coastal
Coastal habitats are dynamic environments located along the interface between land and sea, influenced by tides, waves, and saltwater.
Regenerative
Regenerative organisms possess the ability to regrow lost or damaged body parts, tissues, or organs.
Also known as
Atlantic Blue CrabChesapeake Blue Crab
Collections
Safety
Danger
2/5 · Low
Avoid touching Blue Crabs in the wild as they can pinch with their claws.
Frequently Asked Questions
How big is Blue Crab?
50-200 mm
How long does Blue Crab live?
365-1095 days
What does Blue Crab eat?
These hungry crabs eat almost anything they can find, from tiny fish to plants!
Where is Blue Crab usually found?
Coastal areas
How does Blue Crab hunt?
Ambush, Scavenging, and Foraging
How many legs does Blue Crab have?
10
Snap Map
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