Pneumatic skeleton is found in

Options

A. Amphibians/Rana
B. Reptiles/Wall lizard
C. Birds/Pigeon
D. Mammals/Whale

Answer

**Step-by-Step Solution:**

1. **Understanding the term "Pneumatic Skeleton":**
- A pneumatic skeleton refers to a skeletal structure that includes hollow bones. This adaptation helps reduce the overall weight of the animal, making it easier for them to fly.

2. **Identifying the Class of Animals:**
- The question provides several options: amphibians, rana (a genus of frogs), reptiles, wall lizard, birds, pigeon, mammals, and whales. We need to identify which of these classes typically possesses a pneumatic skeleton.

3. **Analyzing the Options:**
- **Amphibians (e.g., frogs)**: They do not have a pneumatic skeleton.
- **Reptiles (e.g., wall lizard)**: They also lack a pneumatic skeleton.
- **Birds (e.g., pigeon)**: Birds are known for their lightweight skeletal structure, which includes pneumatic bones.
- **Mammals (e.g., whales)**: Mammals do not have pneumatic bones.

4. **Conclusion:**
- Among the provided options, birds, specifically pigeons, are the only animals that possess a pneumatic skeleton. Their bones are lighter and some are hollow, which aids in flight.

5. **Final Answer:**
- The correct option is **birds (pigeon)**.

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