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The Zoological Society of London starts constructing a new centre for the conservation of frogs, toads and amphibians in general within the complex of London Zoo.

The 4 million dollar project will include a public exhibit, laboratories for disease research, and a number of captive breeding facilities. The scientists involved claim it will be the first centre of such significance in the world, and it is extremely necessary to be done now, as the amphibians are the most threatened class of animals – one third of their species have various risk of extinction.

One of the last portraits painted by Pablo Picasso is to be displayed at Sotheby's auction house in London.

Dora Maar With Cat, which depicts one of the Spanish artist's many lovers, is expected to fetch $50m (£28.5m) when it goes on sale in New York on 3 May.

The 1941 artwork will become one of the 10 most expensive paintings ever sold if it commands that price.

Four Picasso paintings are already in this league, including biggest seller Boy With Pipe, sold for $104m (£59.4m).