Most of these fish of the Tetradontidae family contain tetradoxin, a strong poison produced by bacteria that live in their bodies. Tetradoxin is a poison that stops the nerve cells" ability to communicate, and even 1 milligram can cause a human being"s death. These fish"s skin is rough and flexible. Thanks to a bone under their chin, they are able to swallow water and then double their size by locking this bone. Pictured is a moon fish that lived 150 million years ago, with the identical appearance and structure of moon fish living today. This fossil exposes once again that evolution is a fictious concept.