Arthropods are animals that are members of the phylum Arthropoda. More than 80% of all of the animals in the world are arthropods. With such a large group of animals, there is quite a lot of diversity - and quite a lot of examples - but they do have some similar traits:

Invertebrates
An exoskeleton, or external, skeleton made of chitin and it is covered with a thick protective layer, or cuticle
Segmented bodies
Six legs or more which are jointed. In fact, their name comes from the Greek words for “joint” and “foot.”

Mud-crab definition

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