Puffer Fish
This harmless-looking “beach ball” is actually a puffer fish, washed up on a Karnataka, India, shoreline. The fish, also known as a blowfish, attempts to make itself inedible by ingesting enormous amounts of water (or air) and swelling to several times its typical size. Lucky is the predator that heeds this warning. Those that don't might not live to repeat the mistake.
Puffer fish contain tetrodoxin, which is lethal to many fish—and to humans, who have yet to develop an antidote. Some Japanese consider the puffer a delicacy, though one fish holds enough toxins to kill 30 people.
(source:google/http://ocean.nationalgeographic.com/)
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