Why The Box Jellyfish is The Best Jellyfish

The Cubozoa, AKA The Box Jellyfish, is arguably the
coolest (and most venomous) animal in the world.

The medusa form of a box jellyfish has a squarish, box-like bell, from which its
name is derived. From each of the four lower corners of this hangs a short pedalium or stalk which
bears one or more long, slender, hollow tentacles. The rim of the bell is folded inwards to form a shelf
known as a velarium which restricts the bell's aperture and creates a powerful jet when the bell pulsates.
As a result, box jellyfish can move more rapidly than other jellyfish;
speeds of up to 6 metres (20ft) per minute have been recorded.

More reasons Box Jellies are cool(in my opinion):

• They're box-shaped. That's awesome.
• Their scientific name is Cubozoa, get it? Cub(e)-ozoa?
• The sting of their venom is the most painful out of
  any known creature on the entire planet. Another name for these STINGY creatures, is Sea Wasps.
• They're transparent, have no brain, have 60 spaghetti-like tentacles,
  and have 24 eyes. Hard to believe they're the most dangerous jelly in the world, but they are!
.
• Lastly, they have been proven to be capable of sleeping at night, cute AND unique!

One question remains,

Why would a box jellyfish need to sleep?

One possibility, suggested by Seymour and his colleagues, is that it uses its eyes to hunt.
"In the dark, when vision is limited, it makes a lot of sense to become inactive, decrease your energy used in locomotion
and divert it to growth."
-Zoology Notes