Which branch of science focuses on the study of birds?

The study of birds is classified under ornithology, which is a specialized branch of zoology. Ornithologists devote their research to understanding various aspects of avian life, such as behavior, physiology, ecology, and conservation. This field encompasses the observation of bird species in their natural habitats, as well as the study of their evolution and the important roles they play in ecosystems.

Other branches listed in the options do not specifically focus on birds. Zoology is the broad study of animals and includes many different sub-disciplines, including ornithology. Biology is an overarching science that encompasses all living organisms, which means it includes everything from plants to animals but does not specialize in any one group. Entomology, on the other hand, focuses exclusively on insects, distinguishing it clearly from ornithology and making it unrelated to the study of birds.