Tyrannosaurus rex skull expected to fetch £13m at US auction

Fossil named Maximus unearthed in South Dakota rated one of most complete T rex skulls ever found

A Tyrannosaurus rex skull discovered in South Dakota is expected to sell for between $15 and $20m (13m-17m) when it is auctioned next month in New York, Sotheby's has said.

The 76m-year-old skull, nicknamed Maximus, is being sold by an anonymous seller at a live auction on 9 December.