Bluebottles
Bluebottles are a type of venomous marine hydrozoan that are commonly found in coastal waters around the world. They have a distinctive blue or purple color and a balloon-like, transparent body that floats on the surface of the water. Bluebottles have long, trailing tentacles that can deliver a painful sting to humans and other prey. These creatures are often seen washed up on beaches, where they can still deliver a sting if touched.