Xiphactinus audax Variante:Sin imprimar Approximate measurements of the Ornithomimus:

Approximate measurements of the Ornithomimus: Scale 1:35 (Complete)

Width 84mm

a Smilodon populator

Possible social behavior

with rapid growth during their teenage years

Xiphactinus audax Variante:Sin imprimar Approximate measurements of the Ornithomimus:Xiphactinus audax was a large predatory bony fish from the Late Cretaceous of North America, known primarily from fossils recovered from marine deposits of the former Western Interior Seaway, especially the Niobrara Formation of Kansas, although its distribution extended across much of the North American interior basin. Originally described by Joseph Leidy in 1870, this taxon belongs to Ichthyodectiformes, a group of Mesozoic actinopterygian fishes