Jellyfish: slippery and wonderful

After some days of inactive the blog comes back :) I hope that new post will be published daily.
New post is about Jellyfish.

Jellyfish have been around for 650 million years. They were here before dinosaurs and sharks! Scientists think there may be 2000 species of jellyfish. They come in all sorts of color: from pale pink or blue to bright orange-red or screaming yellow.

Some jellyfish are transparent. Jellies also range in size from about two and a half centimeters to more than two meters long. Jellyfish are more than 95 % water and have no heart, bones, or brain, and no real eyes.

Where there’s water – from icy polar seas to tropical Pacific shores – there are jellyfish.

Some of them live in fresh water. All jellyfish sting, but not all jellyfish have poison, that hurts humans. Of the 2000 species of jellyfish only about 70 seriously harm or occasionally kill people.

The most dangerous jellyfish are:

• - Australian box jellyfish;
• - Lion’s mane;
• - Portuguese man-of-war;
• - Sea Nettle.The

Australian box jellyfish, or sea wasp, is the most dangerous jellyfish in the world. It can kill you within minutes. If it stings you, you can become paralyzed and then drown.

A large box jellyfish has enough venom to kill 60 people. Many beaches in Australia have kits with special anti-venom in case it happens to swimmers.

A soup of driver tentacles was once used in a murder attempt – it wasn’t successful.
The Portuguese man-of-war is world-famous for its extremely painful sting. In fact, it is not a true jellyfish, but rather a collection of separate organisms each with a special job to do, working as a unit.