Sharks on the Great Barrier Reef

A family on holiday in Queensland Australia, decided they would like to go scuba diving on the Great Barrrier Reef.
 Their 15 year old son wanted a picture of his Mum and dad in all their diving gear, so he got the under water Camera and swam down with them. When it came to taking the picture of his parents the dad realized that the son looked like he was having a panic attack as he took the picture.

The son swam to the surface and back to the boat as quick as he could and the mum and dad followed to see if he was alright..
When they got back to him he was scrambling on board the boat in a absolute panic, screaming "shark shark". When the parents asked where? he said  "there was a effin shark behind you". The dad thought he was joking, but the skipper of the boat said he had seen it as well.. As soon as they got back to their hotel room their son loaded the picture onto the laptop and this is what they saw.

Mud Crabs

Mud Crabs are marine and estuarine coastal dwellers that can tolerate low salinity for extended periods, preferring shallow water with...