Early Cretaceous - 111 Mya
South America: Brazil
Length: 8 meters (26 ft)
Height: 3 meters (9 ft)
Weight: approximately 1 tonne (2,000lb)
Competing for food in the brackish waters of pre-historic Brazil, Irritator may have preyed upon both land and aquatic animals as an opportunistic feeder. Strong neck muscles, nostrils shifted to the rear of the skull and a secondary palate that allowed for respiration when most of the jaw was under water made this dinosaur unique. If caught in the elongated snout and pointed teeth, escape was unlikely.
The skull of Irritator, collected, doctored with plaster and sold by illegal fossil dealers in Brazil proved such a source of frustration to paleontologists that it was the genesis of the name.