Abstract
Ornithology is the study of birds. Birds are members of the class Aves. Their most distinguishing feature is the presence of feathers as a covering for their bodies. Feathers enable most birds to fly, which requires a lot of energy and low weight. Researchers study their high metabolism, hollow bones, gizzard, and one-way respiratory system. Birds must eat frequently to minimize heavy fat. They have complicated mating rituals, lay eggs, and make nests. Ornithological research also explores migration, taxonomy, evolution, conservation, and diversity. Volunteers of birdwatching hobbyists are utilized to collect data which lowers costs and workload. This paper presents an annotated bibliography of key monographs, organizations, data sources, field guides, and core journals.
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