Ornithology is study of

Options

A. Birds
B. Reptiles
C. Fishes
D. Fossils.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the definition of ornithology and what it specifically studies.

2. **Analyzing the Options**: The options provided are:
- A) Birds
- B) Reptiles
- C) Fishes
- D) Fossils

3. **Identifying the Correct Definition**:
- **Ornithology**: This term specifically refers to the study of birds. Therefore, option A is the correct answer.
- **Herpetology**: This is the study of reptiles and amphibians, which corresponds to option B but is not relevant to ornithology.
- **Ichthyology**: This is the study of fishes, which corresponds to option C but is also not relevant to ornithology.
- **Paleontology**: This is the study of fossils, which corresponds to option D and is also not relevant to ornithology.

4. **Conclusion**: Based on the definitions and analysis, the correct answer to the question "Ornithology is the study of" is option A) Birds.

**Final Answer**: Ornithology is the study of birds.

---