The event is co-organised by the Zoological Society of London (ZSL) Dr Nathalie Pettorelli and the Dr Seirian Sumner from the University of Bristol.

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However, the Zoological Society of London found the apes enjoyed getting stuck into a puzzle, with or without the opportunity to win a prize.

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The mysterious creature was traced by a joint team from the Zoological Society of London (ZSL) and Sri Lanka who conducted about 1, 000 nocturnal searches in mountain forest.

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"Growing external resource dependencies are putting countries at significant risk, " said Mathis Wackernagel, President of Global Footprint Network, which collaborated with the WWF and the Zoological Society of London on the report.

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Having carried out a search with other aquariums around the world and failed to find a mate for their bachelor boys, the team at the Zoological Society of London are now hoping that someone may have a female in a private collection.

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Dr Nathalie Pettorelli, Institute of Zoology, Zoological Society of London Dr Nathalie Pettorelli will use her For Women In Science Fellowship to support her research at the Institute of Zoology, Zoological Society of London.

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