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Learn about birds or class aves Aves are the first vertebrates who have warm blood in their body. Discover what a bird is, its characteristics, and its relationship to mammals and dinosaurs.

They have wings modified from their forelimbs and developed flying muscles. The aves class contains around 9000 species that show courtship, parental care, nest building, and most importantly territorial behavior In classifying birds, most systematists have historically relied upon structural characteristics to infer evolutionary relationships.

Birds are vertebrates with feathers, modified for flight and for active metabolism

Birds are a monophyletic lineage, evolved once from a common ancestor, and all birds are related through that common origin There are a few kinds of birds that don't fly, but their ancestors did, and these birds have secondarily lost the ability to fly. They are characterized by unique features and thrive across nearly every environment on earth Birds are defined by feathers, structures composed of keratin unique to this class.

In this article, we will explore avian diversification, the historical perspectives that shaped bird classification, and the significant advances achieved in understanding their evolutionary relationships through tools such as dna analysis. They are found in almost every ecosystem, from dense rainforests to arid deserts, showcasing incredible diversity in size, color, and behavior.

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