Sea jellies, sometimes called jellyfish, are boneless, brainless and heartless,
and are made almost entirely of water. They are also survivors, and have
been around since before the dinosaurs.
been around since before the dinosaurs.
A bloom of moon jellyfish near Denmark is lit up at night. Jellyfish can make themselves a nuisance by stinging swimmers, clogging the intake pipes of power plants or interfering with fishing. (Casper Tybjerg, http://www.ttf.dk)
http://www.cbc.ca/news/technology/story/2012/04/20/science-jellyfish-populations.html