What are the characteristics of crabs: appearance, sound, movement

The crab's eyes open wide, like two black pearls.

Its head joins the thorax to become the cephalothorax, the main part of the crab's body. Its back is covered with a round and hard dorsal armor, which is undulating but symmetrical from side to side.

In the middle of the anterior edge of the dorsal carapace is the frontal region, with 4 tooth processes, called frontal teeth, and 4 sharp teeth on the left and right sides, called lateral teeth. The posterior side of the dorsal carapace is oblique medially, and the posterior margin is relatively straight at the junction with the abdomen. On either side of the forehead, there is a pair of compound eyes that protrude forward, and the peduncle has a large range of motion, sometimes straight, sometimes lying horizontally in the eye socket.

The inner side of the compound eye, transversely under the forehead, has two pairs of antennae, the first pair is in front of the upper edge of the mouth frame, the tip is short, and the base is large. Inside there is 1 sensory organ called the balancer; The second pair of antennae is located on both sides of the first pair of antennae and is called the outer antennae.

Crawling sideways, the sound of foaming has only been heard.

Crab. I have a crab at home. It's been living in my house for almost two years now. The crab wears blue-gray armor, like a majestic general, very cute, with two pincers, one large and one small, and a pair of eyes the size of mung beans.

The crab is carefree all day long, does not have to do anything, sometimes walks around in the bucket, and you will hear a "squeak" sound as the crab walks, and when it is tired of walking, it will stop and rest; When you're hungry, eat some rice. When the crab first came to my house, it would always spit out some sludge from its mouth, which made the water in the bucket very dirty, and I had to change the water for it every half a day. Tell you, it's hard to help the crab change the water:

At first, you have to take it out carefully, or you will get caught in it; Then pour out the dirty water; Then wipe the bucket clean and fill it with some water; Put the crab in again, and you're good to go. After listening to my description, you will definitely think that it is very hard to change the water of the crab! But if you change more, you won't feel like that.

I love my crab, I've been raising it for almost two years, I know it very well, I sometimes play with it, sometimes I play hide and seek with it, it brings me a lot of fun.

Summary. Hello dear <>

Crabs have 2 sounds. One is the sound of bubbles in the mouth. One is the sound of climbing sideways.

Crabs do not have vocal cords. Crabs belong to the class mollusk, decapods, are crustaceans, the body is protected by a hard shell, respire by gills, and in taxonomy, it is the same kind of animal as shrimp, lobster, and hermit crab.

Crabs have several sounds.

Hello dear <>

Crabs have 2 types of foci or sounds. One is the sound of bubbles in the mouth. One is the sound of climbing sideways.

Crabs do not have vocal cords. Crabs belong to molluscs, decapods, are crustaceans, the body is protected by a hard shell, respire by gills, in taxonomy, it is the same kind of animal as shrimp, lobster, and hermit crab.

The vast majority of species of crabs live in the sea or near the sea, but some cherry blossoms inhabit freshwater or land. When jujube is in the water, the crab may make some noises. But these sounds are not their cries, they are just the sounds they make when they spit bubbles or lap on the water.

These sounds are not made by the dismantling themselves, so naturally they cannot be counted as their cries.

The four basic characteristics of crabs:

1. Crabs are mostly green backs, and the shells are green mud colored, smooth and shiny.

2. Crabs are mostly white-bellied, and the navel belly carapace attached to the mud is crystal white and has no ink-colored spots.

3. The crab vertical early key is mostly yellow hair, and the hair of the crab leg is long and yellow, and the roots are straight.

Fourth, the crab is mostly golden claws, the crab claws are golden, solid and powerful, placed on the glass plate, the eight-legged Yu Qiaoqiao stands upright, the double chela is in the air, the umbilicus is raised, the majesty is dignified, the meat is fat and tender and delicious. Open wide.

Crabs are a common marine creature and one of the delicacies. Some of their characteristics can be fully understood from different perspectives, as explained below.

First of all, the appearance characteristics of crabs are more obvious. The upper and lower shells of their bodies combine to form a hard shell, usually oval or triangular in shape. Crabs also have hard spines and small hairs on their bodies, which are used to protect themselves from being attacked by predators.

In addition, crabs have a pair of large pincers, which vary in color and size, and the pincers have a strong grip and can hold many things, including food and roll enemies.

Secondly, the living habits of crabs are also worth paying attention to. Crabs are benthic organisms that usually live on the bottom of the sea or near the coast, and some also live in freshwater. They prefer to be nocturnal because they have more food and are safer at night.

Finally, there are some human-related traits of crabs that deserve attention. For example, they are a delicacy that people can use as ingredients to make a variety of delicacies. In addition, crabs also have certain applications in agriculture and medicine, for example, stocking crabs in rice fields can increase rice yields, and crab xanthins can be used to prevent cancer, regulate blood sugar, etc.

In general, crabs are a very unique creature in nature, and their hard shell and pincers, nocturnal activity, and penchant for cleaning up garbage all give them a certain advantage in the population. At the same time, humans can also take advantage of some of the characteristics of crabs, such as food, agriculture, medicine, etc., so that they play different roles in human society. <>

The introduction and characteristics of crabs are explained below

What are the characteristics and skills of crabs Crabs are characterized by a pair of very special eyes, called shank eyes, which can be retracted up and down with thick eyes. The crab's ability is mainly the ability of self-protection, that is, when the crab is caught by the enemy and its life is in danger, it will desperately break the caught foot and run away, and after the foot is broken, it will come back from the original breaking point. · Characteristics of crabs 1, crabs spend most of their time looking for food in rock oranges, they are generally not picky eaters, as long as the chela can get the food can be eaten, small fish and shrimp are their favorites, but some crabs eat seaweed, and even animal corpses and plants can eat.

2. Crabs eat other animals, and other animals may also eat crabs.

Fujian sentence iiiiiu hahahaha I guess it's very much.

1. Crabs spend most of their time looking for food, they are generally not picky eaters, as long as the chela can get the food can be eaten, small fish and shrimp are their favorites, but some crabs eat seaweed, and even animal carcasses and plants can eat.

2. Crabs eat other animals, and other animals may also eat crabs.

3. Rely on female crabs to give birth to baby crabs, and each time the female crab will lay a lot of eggs, the number of which can reach more than millions.

4. The crab's thoracic cavity has five pairs of appendages, which are called thoracic feet. The pair of appendages in front of it have strong chelae that can be used for foraging, and the other four pairs of appendages are crab feet.

5. Most species of crabs live in the sea or near the sea, and some inhabit freshwater or land.

Eight claws walk sideways with two pliers.

The crab is an arthropod that lives in both marine and freshwater, and its main feature is that its shell is a typical "garnet" color, densely covered with wart grains of various sizes, making it easy to identify it. The crab's body is divided into three parts: head, thorax and abdomen, which can be stretched and stretched, allowing them to have great flexibility and reaction speed when escaping and defending. The crab's eyes are distributed on both sides of the head and have great visual abilities, as well as two pairs of antennae, one for touch and one for smell.

Crabs have flat bellies and strong swimming and breathing abilities, and different types of crabs have their own unique characteristics.

As an aquatic creature with high economic and food value, crabs have many different species, and these different species share different characteristics from each other. For example, hairy crabs and pike crabs are very common crabs in southern China, and they both have large claws and gray-green shells. In other countries, such as the United States and Canada, blue crabs and snow crabs are more familiar, and they are very distinctive in shape and color.

In general, the characteristics of crabs are varied, but they all have characteristics such as hard shells, claws, and swimming bellies. One can identify the species and habits of crabs by looking at their appearance, as well as get a better understanding of this mysterious sea creature. <>