Sea angels are small, gelatinous sea slugs that spend their entire lives swimming in the ocean.
They can be found in all oceans, from the polar areas to tropical waters.
They are predators that eat mostly small herbivorous sea snails known as sea butterflies.
They can swim twice as quickly as their prey, giving them a substantial advantage in hunting.
Their transparent bodies give the impression that they are floating in air.
Next: 8 Wonderful places for swimmers in the world
Find out More..