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Example 2

Dinosaurs are a varied group of animals from taxonomicmorphological and ecological standpoints. Birds, at over 10,000 living species,[8] are the most diverse group of vertebrates besides perciform fish.[9] Using fossil evidence, paleontologists have identified over 500 distinct genera[10] and more than 1,000 different species of non-avian dinosaurs.[11] Dinosaurs are represented on every continent by both extant species (birds) and fossil remains.[12] Through the first half of the 20th century, before birds were recognized to be dinosaurs, most of the scientific community believed dinosaurs to have been sluggish and cold-blooded. Most research conducted since the 1970s, however, has indicated that all dinosaurs were active animals with elevated metabolisms and numerous adaptations for social interaction. Some were herbivorous, others carnivorous. Evidence suggests that egg-laying and nest-building are additional traits shared by all dinosaurs, avian and non-avian alike. (more…)