Tickers of interest include SLW, AEM, NEM, ABX, GG, SSRI, CDE, AG, HL, GDX, GDXJ, ZSL, SLV, and GLD.

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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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The ZSL work is being undertaken in the Sea of Cortez (also known as the Gulf of California), where sperm whales (Physeter macrocephalus) gather in large numbers.

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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.

BBC: 'Extinct' primate, slender loris, pictured in Sri Lanka

"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.

BBC: Website calls on people to become 'bat detectives'