Our animals

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Northern lakes and seas

The ocean

Tropical rivers and lakes

Select aquaria

The Pond

Danish forest lake

The wide creek

Sturgeon

Danish stream

Under construction

Herrings in the Sound

Boulder reef in the Sound

Small animals of the stone reef

Select species

Select a species to read more


Corkwing wrasse

Corkwing wrasse

Ballan wrasse

Ballan wrasse

Cuckoo wrasse

Cuckoo wrasse

Cuckoo wrasse

Cuckoo wrasse

Goldsinny-wrasse

Goldsinny-wrasse

Three-spined stickleback

Three-spined stickleback

Lumpsucker

Lumpsucker

Tadpole fish

Tadpole fish

Topknot

Topknot

Greater weever

Greater weever

Eelpout

Eelpout

Shorthorn sculpin

Shorthorn sculpin

Green crab

Green crab

Edible crab

Edible crab

Common starfish

Common starfish

Edible sea urchin

Edible sea urchin

Dahlia anemone

Dahlia anemone

Plumose sea anemone

Plumose sea anemone

Common whelk

Common whelk

Green crab

Green crab

Facts

LatinCarcinus maenas
Size7 cm
FoodDead animals, small crustaceans and worms
HabitatSeaweed meadows, boulder reefs and sand bottom
IUCN

Not evaluated

LocationNorth Atlantic
Map

Tastes with its legs

Most people would probably say it is impolite to put your feet in your food, but for the green crab, it is quite normal. Its legs are covered with tiny hairs which the crab uses for tasting when it finds food on the seabed.

Moulting

The crab has a hard shell that does not grow. Therefore, when the crab grows too big, it crawls out of its shell and forms a new one. While this process is taking place, the crab is soft all over and needs to take extra care to hide until its new shell is fully formed.

Can you tell the difference between the males and females?

The green crab’s tail is completely flat and lies close to its stomach. If you turn it over on its back, you can see that the tail on the male is pointed like a triangle, while on the female it is wide and rounded. This is how you can tell the difference.

Two penises

The male doesn’t have just one, but two penises, which are tucked along its underbelly under its tail. With two penises, it can more easily hang on to the female during mating, which can take up to 24 hours.

Meet a green crab

The green crab is found all over Denmark. You can encounter it while snorkelling along a sandy seabed or a rocky bottom full of seaweed. But you have to look carefully. The green crab is shy and prefers to stay out of sight.


Sandy bottom

Eelgrass in the Sound

Faroese bird cliff

Seaotter

Pacific octopus

Japanese spider crab

American lobster