Which one has a raft- like keel, a preen gland and a penis?
(a) Dromaius
(b) Passer
(c) Struthio
(d) Tinamus

Options

A. Dromaius
B. Passer
C. Struthio
D. Tinamus

Explanation

To solve the question regarding which bird has a raft-like keel, a preen gland, and a penis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Key Terms**:
- **Raft-like Keel**: This is a structure found in birds that aids in flight by providing an attachment point for flight muscles. It is typically more pronounced in birds that are strong fliers.
- **Preen Gland**: This gland produces oil that birds use to coat their feathers, keeping them waterproof and in good condition.
- **Penis**: In birds, this is a reproductive organ found in males, which is not common in most bird species as many rely on cloacal contact for reproduction.

2. **Analyze Each Option**:
- **(a) Dromaius**: Commonly known as the emu, this bird does not have a pronounced keel or a penis.
- **(b) Passer**: This refers to the house sparrow, which also lacks a keel and has a different reproductive structure.
- **(c) Struthio**: Known as the ostrich, while it has some adaptations for flight, it does not possess a raft-like keel or a penis.
- **(d) Tinamus**: This bird is known to have a raft-like keel, a preen gland, and a penis.

3. **Identify the Correct Answer**:
- After analyzing all options, it is clear that **Tinamus** is the only bird that possesses all three features: a raft-like keel, a preen gland, and a penis.

### Final Answer:
The correct option is **(d) Tinamus**.

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