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Numbray, Hypnos monopterygium
(Hypnos monopterygium)
This somewhat odd-looking ray has the ability to stun their prey and surprise a non-suspecting diver with an electric shock. The electric field is generated by two specialised organs located on its back on either side of the spine. This ray normally buries itself in the sand waiting for some food to come past. In March, however, large numbers can be seen swimming around at Julian Rocks.