Wiehenvenator is a predatory megalosaurid theropod dinosaur from the Middle Jurassic (Callovian) of Germany. In 1998, geologist Friedrich Albat at the abandoned Pott quarry in the Wiehen Hills near Minden, Westphalia, discovered the remains of a large theropod. These were excavated between October 1998 and October 2001. The find received extensive press attention and was informally known as Das Monster von Minden (the Minden Monster). Reports in the German edition of the National Geographic of a rib 50% larger than that of Allosaurus stirred speculations of it being up to 15 metres (49 ft) in length. Thomas Holtz estimated it at 12 metres (39 ft) in 2012. Other researchers concluded to smaller dimensions: Mickey Mortimer in 2003 estimated the animal to be 7 to 8 metres (23 to 26 ft) in len