All the following Avian characters are correct, except

Options

A. Bones do not have bone marrow
B. Scales are present only in the hindlimbs region
C. In females, right ovary is atrophied
D. Beak possesses homodont teeth

Answer

To solve the question regarding avian characters, we need to analyze each of the provided options and determine which one is incorrect.

### Step-by-Step Solution:

1. **Understanding Avian Characteristics**:
- Birds, or avian animals, have distinct characteristics that differentiate them from other animal groups.

2. **Option 1: Bones do not have bone marrow**:
- This statement is true. Birds have hollow bones that are filled with air, which helps reduce their weight for flight. They do not contain bone marrow like many other vertebrates.

3. **Option 2: Scales are present only in the hemipenes regions**:
- This statement is somewhat misleading. While most birds do not have scales like reptiles, there is an exception in the case of the Trogan bird, which has scales in certain regions. Thus, this statement can be considered correct in a specific context.

4. **Option 3: In females, the right ovary is atrophied**:
- This statement is true. In most bird species, the right ovary is reduced or atrophied, while the left ovary is functional and develops fully.

5. **Option 4: Beak possesses homodont teeth**:
- This statement is false. Birds do not have teeth; instead, they have beaks. Homodont teeth refer to having teeth of the same type, which is not applicable to birds. Therefore, this option is incorrect.

### Conclusion:
The incorrect avian character among the options provided is **"beak possesses homodont teeth."**

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