What members of the class ostriches are the most abundant and diverse vertebrates?

The most abundant and diverse vertebrates within the class Aves, which includes ostriches, are typically the smaller bird species, such as sparrows and finches. These birds thrive in various environments and exhibit a wide range of adaptations that contribute to their diversity. In contrast, ostriches, being large Flightless Birds, are less diverse and are primarily adapted to specific habitats like savannas and open grasslands.