 The Copenhagen skull ( specimen <unk> 90 @-@ 806 ) is known to have been part of the collection of <unk> <unk> in <unk> until 1651 , when it was moved to the museum in <unk> Castle , Schleswig . After the castle was occupied by Danish forces in 1702 , the museum collection was assimilated into the Royal Danish collection . The skull was rediscovered by J. T. Reinhardt in 1840 . Based on its history , it may be the oldest known surviving remains of a dodo brought to Europe in the 17th century . It is 13 mm ( 0 @.@ 51 in ) shorter than the Oxford skull , and may have belonged to a female . It was mummified , but the skin has perished . 
