2019年5月23日 · Scientific evidence indicates that there are two types of dinosaurs: avian and non-avian dinosaurs. There are several differences between avian and non-avian dinosaurs including their extinction, bone structure, and metabolic processes.

Using fossil evidence, paleontologists have identified over 900 distinct genera and more than 1,000 different species of non-avian dinosaurs. Dinosaurs are represented on every continent by both extant species (birds) and fossil remains.

Many non-avian dinosaurs were feathered. Direct evidence of feathers exists for the following species, listed in the order currently accepted evidence was first published.

2020年9月15日 · With hindsight, birds can be categorized as avian dinosaurs and all the other sorts—from Stegosaurus to Brontosaurus —are non-avian dinosaurs. The entire reason paleontologists make that...

Non-avian dinosaurs (all dinosaurs besides birds), which are now extinct, varied greatly in shape and size. Some weighed as much as 80 tons and were more than 120 feet long. Others were the size of a chicken and weighed as little as 8 pounds. All non-avian dinosaurs lived on land.

2022年7月8日 · Most ornithischians can be placed in one of five groups: Ankylosauria (armored dinosaurs), Ceratopsia (horned dinosaurs), Ornithopoda, Pachycephalosauria (bone-headed dinosaurs), and Stegosauria (plated dinosaurs).

This shocking realization makes even the smallest hummingbird a legitimate dinosaur. So rather than refer to "dinosaurs" and birds as discrete, separate groups, it is best to refer to the traditional, extinct animals as "non-avian dinosaurs" and birds as, well, birds, or "avian dinosaurs."

2023年11月8日 · New research demonstrates that the brain of Thescelosaurus neglectus, a small plant-eating neornithischian dinosaur that lived just before the end-Cretaceous mass extinction event, was relatively small compared to most other neornithischians.

One method is to measure the circumference of the femur, which in non-avian theropod dinosaurs has been shown to be a relatively proportional to quadrupedal mammals, [32] and use this measurement as a function of body weight, as the proportions of long bones like the femur grow proportionately with body mass. [32]

2000年12月7日 · 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 1. Here we report on a new...