As of May 2020, the Royal Bank of Scotland is in the process of adopting a new series of banknotes. These will be made of polymer. Three (the £5, £10 and £20 notes) have already been released. The £5 note shows poet Nan Shepherd on the obverse accompanied by a quote from her book 'The Living Mountain', and the Cairngorms in the background. The reverse displays two mackerel and an excerpt from the Scottish Gaelic poem ‘The Choice' by Sorley MacLean. The obverse of the £10 note shows scientist Mary Somerville, with a quote from her work 'The Connection of the Physical Sciences', and Burntisland beach in the background. The reverse displays two otters and an excerpt from the poem ‘Moorings' by Norman MacCaig. The obverse of the £20 note shows entrepreneur Catherine Cranston. The reverse shows two red squirrels and a quote from the Scots language poem 'Venus and Cupid' by Mark Alexander Boyd