Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, and armed with a single pair of chelae (claws). Crabs are found in all of the world's oceans, while many crabs live in fresh water and on land, particularly in tropical regions. Because crabs have sharp claws and well hide, it is not easy to catch crabs.
This is one interesting way to catch crabs, using simple materials made by bamboo, root, knife and worms:
+ Use a knife to dig worms and hold them in a bamboo tube
+ Collect some firm small bamboo trunks and tie tree root at one head
+ Tie worms at the other head of the tree roots to make bait
+ Use these tools to catch crabs
Remember to hold crabs carefully after catching them because they could move away immediately

In the forest, it is difficult for us to find a pot to cook crabs. An intelligent way to solve this problem to using a bamboo trunk :
+ Find a big bamboo trunk
+ Separate one small piece on it to put crabs inside
+ Pour some water into the bamboo pot
+ Set a fire, put the bamboo pot above

Just after half an hour, you have a perfect crab dish to enjoy.
Hope this help!