The necks of the sauropod dinosaurs reached 15 m in length: six times longer than that of
the world record giraffe and five times longer than those of all other terrestrial animals …

Predatory theropod dinosaurs can usually be identified as such by features of their jaws,
teeth, and postcrania, but different clades of these reptiles differed in their adaptations for …

Aardonyx celestae gen. et sp. nov. is described from the upper Elliot Formation (Early
Jurassic) of South Africa. It can be diagnosed by autapomorphies of the skull, particularly the …

Fossils of the Early Cretaceous dinosaur, Nigersaurus taqueti, document for the first time the
cranial anatomy of a rebbachisaurid sauropod. Its extreme adaptations for herbivory at …

The evolutionary radiation of dinosaurs in the Late Triassic and Early Jurassic was a pivotal
event in the Earth's history but is poorly understood, as previous studies have focused on …

Sauropod dinosaurs were the largest terrestrial animals and their growth rates remain a
subject of debate. By counting growth lines in histologic sections and relating bone length to …

Sauropods, the giant long-necked dinosaurs, became the dominant group of large
herbivores in terrestrial ecosystems after multiple related lineages became extinct towards …

Background Archaeopteryx is the oldest and most primitive known bird (Avialae). It is
believed that the growth and energetic physiology of basalmost birds such as Archaeopteryx …

Brachiosauridae is a clade of titanosauriform sauropod dinosaurs that includes the well-
known Late Jurassic taxa Brachiosaurus and Giraffatitan. However, there is disagreement …

Non-avian dinosaurs are mostly medium to large-sized animals, and to date all known
mature specimens are larger than the most primitive bird, Archaeopteryx. Here we report on …