CATDOLL : CATDOLL: There are several types of crabs.

1. How many types of crabs are there?

Spider crab, ballast crab, river crab, hermit crab. The thing on the belly of a male crab is pointed. The female crab is round.

2. Description of the crab's appearance

The hard shell on the crab can protect it from natural enemies, but the shell does not expand as the body grows. Therefore, the growth of crabs is intermittent, that is, the body will continue to grow after the old shell is shed after a period of time. The largest crab on earth is the spider crab, whose legs are 3.7 meters wide when spread out, and the smallest crab is the bean crab, which is less than half a centimeter in diameter.

Although crabs are small, they have all the organs. After removing the hard shell of the crab, we can find that the crab's body is protected by a layer of shell. These shield-like shells are called carapace by biologists. The crab's body is symmetrical and can be divided into the forehead area, eye area, heart area, liver area, stomach area, intestine area, and gill area. The two sides of the crab's body are connected by appendages. The appendages on the head are called antennae, which have the functions of touch and smell. Some appendages have mouth functions, which are used to tear food and put it into the mouth.

The crab's thorax has five pairs of appendages, called thoracic legs. The front pair of appendages has strong claws that can be used for foraging, and the remaining four pairs of appendages are the crab's feet. Crabs rely on these four pairs of appendages to move around. Their walking style is unique and interesting. Most of them walk sideways instead of straight ahead. However, monk crabs are an exception. They walk straight ahead.

Crabs spend most of their time looking for food. They are not picky eaters and will eat anything they can get their claws on. Small fish and shrimp are their favorites, but some crabs eat seaweed and even dead animals or plants.

Crabs eat other animals, and other animals may eat crabs. For example, humans consider crabs to be a delicacy. Water birds also eat crabs! Some fish also like to eat crab legs, just like humans. When young crabs swim in groups in the sea, they may be gobbled up by other marine creatures. That is why crabs lay a lot of eggs.

Fiddler crabs are common crabs on the seashore. Why are they called fiddler crabs? Because the way these crabs wave their large claws looks like they are waving at the tide, so the name "fiddler" comes from this. In addition, the large claws of male fiddler crabs look like playing a violin, so they are also called fiddler crabs or violinist crabs.

3. Pictures of all crabs (urgent)

Take a look

There are a lot of them here!

4. What are the crabs in the river?

There is a sheep's head there.

5. What types of crabs cannot be eaten?

1. Dead crabs cannot be eaten 2. Crabs cannot be eaten raw