The character found only in birds is :-

Options

A. Toothless beak
B. Bipedal locomotion
C. Wings
D. Feathers

Answer

To solve the question regarding the character found only in birds, we will analyze the options provided step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a characteristic that is unique to birds. This means we need to identify a feature that is not found in any other group of animals.

2. **Analyzing Option 1: Toothless Beak**:
- **Explanation**: Birds have beaks that are typically toothless. However, this characteristic is not exclusive to birds as some extinct species, like certain dinosaurs, also had toothless beaks.
- **Conclusion**: This option is incorrect.

3. **Analyzing Option 2: Bipedal Locomotion**:
- **Explanation**: Bipedal locomotion refers to the ability to walk on two legs. While birds are bipedal, many mammals (like humans) also exhibit bipedal locomotion.
- **Conclusion**: This option is incorrect.

4. **Analyzing Option 3: Wings**:
- **Explanation**: Wings are a defining feature of birds, but they are also present in insects and some other flying animals. Therefore, wings are not exclusive to birds.
- **Conclusion**: This option is incorrect.

5. **Analyzing Option 4: Feathers**:
- **Explanation**: Feathers are unique to birds. They serve multiple functions including insulation, protection, and aiding in flight. No other animal group possesses feathers.
- **Conclusion**: This option is correct.

### Final Answer:
The character found only in birds is **feathers** (Option 4).

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