Bird and mammals share one of the common feature

Options

A. Vivipary
B. Pigmented skin
C. Warm blooded
D. Alimentary canal with some modifications.

Answer

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks for a common feature shared by birds and mammals.

2. **Analyze the Options**:
- **Option A: Viviparity**: Viviparity refers to giving birth to live young. Birds primarily lay eggs (oviparous), while most mammals give birth to live young (viviparous). Therefore, this is not a common feature.

- **Option B: Pigmented Skin**: While some birds and mammals have pigmented skin, it is not a defining characteristic shared by both groups. Thus, this option is also not a common feature.

- **Option C: Warm-blooded**: Birds and mammals are both classified as warm-blooded (homeothermic), meaning they can maintain a constant body temperature regardless of environmental conditions. This is a common feature shared by both groups.

- **Option D: Elementary Canal with Some Modifications**: Birds have specialized parts in their digestive system, such as the crop and gizzard, which are not present in mammals. Hence, this is not a common feature.

3. **Conclusion**: After analyzing all the options, the only common feature between birds and mammals is that they are both warm-blooded. Therefore, the correct answer is **Option C: Warm-blooded**.

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