Everybody[1] knows that in the early years of the 20th Century, the Carnegie Museum in Pittsburgh sent casts of its iconic Diplodocus around the world. Ten casts, in fact: to London, Berlin, Paris, Vienna, Bologna, St. Petersburg, La Plata, Madrid, Mexico City and Munich. The first nine were all mounted, and most still stand in their original museums. (The London cast has moved around a lot and currently resides in Coventry;