The ways to make a small nest for crabs are as follows:

1. Prepare a sink, put it in the shade, fill it with water, and keep the water temperature between 25 and 3 degrees.

2. Prepare some stones, sand and gravel bottoms, so as to simulate the natural living environment of crabs.

3. Prepare some plants and branches so that crabs can crawl around. Prepare some crab food, such as shrimp, earthworm, shrimp, rice, etc. If you have some activated carbon, you can also put some.

4. Prepare a small box and put it in the water so that crabs can get in and out.

Crabs' living habits:

Crabs spend most of their time looking for food. They are generally not picky eaters. They can eat all the food they can get with their claws. Small fish and shrimp are their favorite, but some crabs eat seaweed, even animal carcasses and plants.

crabs eat other animals, and other animals may also eat crabs. For example, humans regard crabs as delicacies, and waterfowl also eat crabs. Some fish also like to eat crab feet like humans. Young and underage crabs may be preyed by other marine life when they float in the sea in groups, so crabs have to lay a lot of eggs when laying eggs to ensure the survival rate of crabs.

They rely on the mother crab to give birth to small crabs. Every time, the mother crab will lay a lot of eggs, which can reach millions or more. After these eggs hatch in the abdomen of the mother crab, the larvae can leave the mother and float around with the coastal current. After several times of molting, it grows into a big-eyed larva, and the big-eyed larva grows into a young crab after several times of molting. The appearance of the young crab is almost the same as that of an adult crab, and it becomes a crab after several times of molting.