1 of the 2 species I will be talking about is the spider crab, we get about 7 everyday and the spider crabs are huge. They live very deep under the water where they can camoflouge and blend in with the ocean ground. They live up to 50-100 years. These crabs are really calm and are unable to swim so they spend most of their time just crawling on the ocean bed. Another species is European green crabs which are invasive. They can decimate shellfish populations, displace native crabs, and damage eelgrass and salt marsh habitats. They eat clams , mussels , oysters and marine worms. These crabs move extremely fast and are super aggressive. These crabs are so bad because it outcompetes local species in harbors.