Figure 32.25 Diversity among the Birds (A) Perching, or passeriform, birds such as this western bluebird constitute the most species-rich of all bird groups. (B) Some 375 species of parrots, macaws, parakeets, and lorikeets such as the one shown here are another large bird group. (C) The great horned owl is a nighttime predator that can find prey using its sensitive auditory “sonar” system. (D) The long-billed curlew of North America is one of many species of wading birds.