Two chalk drawing of penguins, sketched by legendary explorers Captain Scott and Ernest Shackleton, have been discovered at Cambridge University.
The sketches which date from 1904 and 1909, are signed by the renowned polar explorers.
They were probably drawn to illustrate public lectures that the pair gave after returning from their Antarctic voyages.
The blackboards were found lying in the basement of the university's Scott polar research institute. No one is sure when they arrived or how they found their way to Cambridge.