Why they're awesome: The largest animal on Earth is thought to be the blue whale, but these strange sea creatures can grow even longer — reaching up to 150 feet (46 meters) in length. There are ...

Onlookers found Velella velella spread out on beaches, which scientists believe is a result of climate changes ...

This beautiful siphonophore, Pyrostephos vanhoeffeni, is typically encountered in Antarctic waters. Siphonophores are not an individual animal, but a colony of individuals that all serve a ...

Not only is it not a jellyfish, it's not even an "it," but a "they." The Portuguese man-of-war is a siphonophore, an animal made up of a colony of organisms working together. The man-of-war ...