One-word substitution (branch of zoology): Select the scientific field that specifically studies birds, including their behavior, ecology, and classification. Context: Distinguish it from eye medicine and other homophone-like terms. Instruction: Choose the correct option.

Given data

• Sought field: study of birds.
• Options: Ornithology, Orology, Optology, Ophthalmology.

Concept / Approach
Ornithology = the branch of zoology dealing with birds. ‘‘Orology’’ studies mountains; ‘‘ophthalmology’’ is medical science of the eye; ‘‘optology’’ is a rare/archaic term sometimes associated with optics, not birds.

Elimination
Ornithology — birds; correct. ✅Orology — mountains/relief; unrelated. ❌Optology — optics (rare) or misused term; not zoology. ❌Ophthalmology — medicine of the eye; human/animal vision health, not birds specifically. ❌

Example
‘‘She specializes in migration patterns in ornithology.’’

Final Answer
Ornithology