The green crab (Carcinus maenas) is a common invasive species in U.S. coastal ecosystems, especially along the East Coast.

The green crab is an invasive species that has significantly impacted coastal ecosystems in the U.S., particularly on the East Coast. Native to Europe, it outcompetes local species for food and habitat, threatening biodiversity and disrupting the balance of coastal ecosystems. While Atlantic cod is a native fish species, it is not invasive. The California sea lion is a native species along the U.S. West Coast, and the loggerhead turtle is a protected species, not invasive. The green crab, however, has become a major concern due to its adaptability and rapid spread.