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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Signatories include former government chief scientist and Royal Society president Lord May as well as Zoological Society of London president Professor Sir Patrick Bateson.

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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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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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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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"Bats use a lot of different types of sounds, from singing to each other to find a mate and to using echoes from their tweets to find their way around, " explained Kate Jones, joint University College of London (UCL) and Zoological Society of London (ZSL) chairwoman of ecology and biology.

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