Why do some animals play dead? by Robert Jones, 26 July 2012 Watch as Sharkman visits the Bahamas to learn the secret of tonic immobility in sharks 2,681 views comments Tags: footage, Sharkman, Sharks, tonic immobility, why do animals play dead More Like This... Environment Fact: 84% of the Earth’s volume is molten rock Yes, over four-fifths of the world’s volume is magma. Explore our planet’s composition now Environment Top 5 Facts: Algae 5 weird and wonderful things you probably didn’t know about algae Environment Who decides which bee is going to be the queen within a bee colony? Dr Peter C Barnard, director of science at The Royal Entomological Society, delivers a swarm of sweet facts. More From The Internet... The Tiger tank It can rain animals What would happen if the Moon moved closer to the Earth? How loud would stars be if space was full of air?