Bird eggs are

Options

A. Alecithal
B. Isolecithal
C. Homolecithal
D. Telolecithal

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the classification of bird eggs based on the distribution of yolk.

2. **Identifying the Options**: The options provided are:
- A) Olecithal
- B) Isolecithal
- C) Homolecithal
- D) Telolecithal

3. **Defining the Terms**:
- **Olecithal**: Eggs with no yolk.
- **Isolecithal**: Eggs with a uniform distribution of yolk throughout.
- **Homolecithal**: Often used interchangeably with isolecithal, indicating equal yolk distribution.
- **Telolecithal**: Eggs with a concentrated yolk at one end, leading to an uneven distribution.

4. **Analyzing Bird Eggs**: Bird eggs are characterized by having a significant amount of yolk, which is not evenly distributed. The yolk is primarily concentrated at one end of the egg.

5. **Conclusion**: Based on the definitions and characteristics, bird eggs are classified as **telolecithal** due to the uneven distribution of yolk.

6. **Final Answer**: Therefore, the correct answer is **D) Telolecithal**.