suggesting the existence of a rigid structure that could have supported a caudal mace

with large temporal fenestrae and wide orbits

The most famous feature of Nigersaurus was its highly specialized head

más cercano en ecología a los odontocetos primitivos que a los misticetos filtradores

Triceratops horridus Onchopristis suggesting the existence of aTriceratops horridus was one of the most iconic dinosaurs of the Late Cretaceous , which inhabited what is now North America approximately 68 to 66 million years ago, just before the great extinction that ended the age of the dinosaurs. Its name means "face with three horns," and refers to its most distinctive feature: two large horns above the eyes and a third, shorter one above the nose , accompanied by a wide, bony frill that protected the neck.