Despite old wives’ tales to the contrary, goldfish actually possess excellent memories. Goldfish can be trained to nudge a lever for food, and even after the lever is removed, they can remember this trick for up to three months.
But goldfish now have some serious competition: sharks.
Dr Vera Schluessel at Rheinische Friedrich-Wilhelms-University in Bonn, Germany has been researching the intelligence of the grey bamboo shark (Chiloscyllium griseum), a carpet shark that dwells in the Indo-West Pacific and reaches lengths of just over 2 ft (0.6 m).
Last year, Schluessel’s PhD student Theodora Fuss subjected juvenile sharks to three different cognition experiments, one at a time, and then tested to see how long the sharks could remember their training. The results are published in the journalAnimal Cognition.
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