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Steve Leonard is scuba diving with stingrays off the coast of the Cayman Islands. They gather here in huge numbers to feed. Rays are sharks’ cousins but their body-plan has flattened out to make the most of life on the sea bed. Rays eat fish and they know Steve has got a juicy morsel in his hand. He has to be careful when feeding them as their mouth has a nasty suck. They don’t have much in the way of teeth but they have a bony plate that acts as a grinder. The rays here usually hunt crab and fish that they can detect hidden in the sand. Stingrays have an array of fine-tuned senses, something that the shark family has taken to a whole new level.