Which of the following is the largest order of class Aves?

The largest order of the class Aves is indeed Passeriformes, which is commonly referred to as the perching birds or songbirds. This order is notable for its vast diversity, comprising more than half of all bird species. Passeriformes are characterized by their unique foot structure, which allows for better gripping of branches, and they possess a highly developed vocal apparatus that enables complex songs and calls.

With over 6,000 species, Passeriformes include a wide array of birds such as sparrows, finches, warblers, and robins, making it the most numerous order within the avian class. This extensive variety is a result of their adaptability to various habitats and their diverse feeding strategies, which range from insectivory to seed-eating.

In contrast, the other options represent smaller orders within the class Aves. Galliformes includes ground-feeding birds like chickens and turkeys, Strigiformes contains owls, and Accipitriformes comprises birds of prey such as hawks and eagles; none of these orders come close to the species richness that characterizes Passeriformes. Hence, the significant difference in species number underscores why Passeriformes is recognized as the largest order of