External ear pinna is found in:-

Options

A. Reptiles
B. Mammals
C. Amphibians
D. Fishes

Answer

To determine where the external ear pinna is found, we can analyze the options provided step by step:

1. **Understanding the Question**: The question asks about the presence of the external ear pinna in different animal groups. The pinna is the outer part of the ear that helps in collecting sound waves.

2. **Evaluating Option 1: Reptilia**:
- Reptiles, such as snakes, do not have a well-developed external ear pinna. Instead, they have a tympanic membrane (eardrum) that is not externally visible. Therefore, this option is incorrect.

3. **Evaluating Option 2: Mammals**:
- Mammals are characterized by the presence of a distinct external ear pinna. The pinna is adapted to collect sound waves effectively. Thus, this option is correct.

4. **Evaluating Option 3: Amphibians**:
- Amphibians, like frogs, have a tympanic membrane but lack a true external ear pinna. Therefore, this option is also incorrect.

5. **Conclusion**: After analyzing all the options, the correct answer is that the external ear pinna is found in **Mammals**.

### Final Answer:
The external ear pinna is found in **Mammals**.