The ocean is full of creatures that seem too bizarre to be real. A perfect example is the strange sea animal featured in the video below, called a feather starfish.
Despite it's name, the feathery animal is not a type of sea star: It is actually a type of creature called a crinoid.
There are two types of crinoids, one of which is the free-floating feather stars, like the one above. The other type, known as the "sea lily," has a stalk that keeps it attached to the sea floor.
There are 600 species of crinoid, and many different types of feather stars.
Though feather stars are not starfish, they are related to them.
Photo source: Flickr/Elias Levy
Sea stars and feather stars both belong to the phylum Echinodermata.
Sea cucumbers and sea urchins are echinoderms, too.
Like their relatives, feathers stars have radial symmetry. But no other echinoderm looks quite as fantastical swimming around the ocean.
Feather stars can swim freely, but they also have a small set of legs that allows them to attach to objects.
Photo source: Flickr/NOAA Ocean Explorere
Meanwhile, their feather-like appendages help them catch plankton drifting through the water.
Though they may look fragile, some feather starfish can live in the high-pressure environment of the deep sea. In fact, one crinoid was caught on camera by the 2015 Okeanos Explorer deep-sea expedition.