The stonefish looks like a stone, just like the reef that it lives on. It also likes to sit on thee sandy seabed. It has spines, that it uses to dafend itself. They are very sharp and contain a nasty venom which can be very painful and sometime lethal. To avoid the stonefish's nasty sting, you mustn't touch the reef while swimming and you should make sure you always wear shoes or sandals when walking in shoallow, sandy water.