The green sea slug, also known as Elysia chlorotica, is a type of marine gastropod found along the Atlantic coast of North America. This unique creature is known for its vibrant green color, which comes from the chloroplasts it incorporates from the algae it consumes. This process allows the slug to perform photosynthesis, providing it with energy from sunlight. Green sea slugs typically grow to about 2 to 4 inches in length and have a soft, elongated body with a distinctive shape. They are often found in shallow waters, where they feed on various types of algae. Their ability to blend in with their surroundings helps them avoid predators.