Furculum, synsacrum and pygostyle are characteristic of :-

Options

A. Snakes
B. Uzard
C. Birds
D. Monotremes

Answer

To determine the correct answer for the question regarding the characteristics of furculum, synsacrum, and pygostyle, follow these steps:

### Step-by-Step Solution:

1. **Identify the Terms**:
- **Furculum**: Commonly known as the wishbone, it is a forked bone found in birds.
- **Synsacrum**: This is a fused structure of several vertebrae that provides support and stability in birds.
- **Pygostyle**: This is a triangular bone formed by the fusion of the last few caudal vertebrae, providing support for the tail feathers in birds.

2. **Analyze the Options**:
- **Option 1: Snakes**: Snakes belong to the class Reptilia and do not possess these structures. Therefore, this option is incorrect.
- **Option 2: Mammals**: Mammals do not have a furculum, synsacrum, or pygostyle. This option is also incorrect.
- **Option 3: Birds**: Birds are known for having all three of these structures. The furculum aids in flight, the synsacrum provides a strong skeletal structure, and the pygostyle supports the tail feathers. This option is correct.
- **Option 4: Monotremes**: Monotremes are egg-laying mammals and do not have these specific skeletal features. Thus, this option is incorrect.

3. **Conclusion**:
Based on the analysis, the structures furculum, synsacrum, and pygostyle are characteristic of **birds**. Therefore, the correct answer is **Option 3: Birds**.