One function of apteria appears to be to aid the bird in losing excess body heat. Some birds use tools to assist their feeding activities. Learning is not important for most songbirds to achieve the complete song of their species. A large vocal repertoire appears to enhance a male bird's reproductive success. Especially because of biochemical data, the hoatzin is now placed in the order Sphenischiformes.
Vocal mimicry is one way that some birds enlarge their vocal repertoires.
Some birds can produce two sets of sounds simultaneously because the vocal apparatus consists of two independent halves. Some birds can see the ultraviolet part of the light spectrum, whereas humans cannot. Draw one bird head for each of the following feeding specializations to show how bill morphology is often specifically adapted to foraging needs. Circle one of the types of soaring listed below.