Ikrandraco avatar Diplodocus carnegii sharp spines—the so-called "thagomizer"—probably used

sharp spines—the so-called "thagomizer"—probably used as an active defensive mechanism against predators

The Model Pose represents a Dilophosaurus specimen sniffing the environment in search of a trace of one of the prey it feeds on

but comparable to medium-sized specimens of Baryonyx

The environment in which Parasaurolophus walkeri lived was dominated by rivers and river plains

Ikrandraco avatar Diplodocus carnegii sharp spines—the so-called "thagomizer"—probably usedIkrandraco avatar was a pterodactyloid pterosaur from the Early Cretaceous, dated to approximately 120 million years ago (Aptian), whose remains come from the Jiufotang Formation in northeastern China. It belongs to the clade Pteranodontoidea and represents a specialized form within the piscivorous pterosaurs of lacustrine environments. It was a medium sized flying reptile, with an estimated wingspan of between 1. 3 and 1. 5 meters. Its body was