Just been watching the DVD of Titchmarsh's Natural History of Britain.
In the section where he is dredging up mammoth tusks and leg bones from the North Sea, he says that "the remains of more than 50,000 mammoths have been recovered from the North Sea over the last 100 years or so". Not sure if he means 50,000 bits of mammoths or remains from 50,000 individual mammoths.

Whichever - it is still a helluva lot and really gives a picture of vast herds of mammoth wandering over steppe-like lowlands. But where are these remains now? They can't all be in cardboard boxes in museum basements, surely. 50,000??