Which of the following characters does not fit for Aves ?

Options

A. Skin is dry, without glands except oil/preen glands at the base of tail
B. Alimentary canal has 2 additional chambers, crop and gizzard
C. Hind limbs are modified for walking, swimming or clasping. Forelimbs are modified into wings.
D. Beak has teeth

Explanation

To determine which character does not fit for Aves (birds), we will analyze the given statements one by one.

### Step-by-Step Solution:

1. **Identify the Characteristics of Aves**:
- Aves, or birds, have specific characteristics that distinguish them from other animal groups.

2. **Analyze Each Statement**:
- **Statement 1**: "They have oil or green glands at their base of teeth."
- This statement is incorrect because birds do not have teeth; they have beaks. Birds do have oil glands (uropygial glands) that help in waterproofing their feathers, but they do not have glands at the base of teeth since they lack teeth altogether.

- **Statement 2**: "In their alimentary canal, two additional chambers and gizzard help in mastication and crushing of food particles."
- This statement is correct. Birds have a specialized digestive system that includes a gizzard, which helps in grinding food.

- **Statement 3**: "Their forelimbs are modified into wings, and their hind limbs are used for walking or swimming."
- This statement is also correct. Birds have wings for flight and their hind limbs are adapted for various functions like walking or swimming.

- **Statement 4**: "The beak had teeth."
- This statement is incorrect. Birds do not have teeth; they have beaks that are adapted for their feeding habits.

3. **Conclusion**:
- The statements that do not fit the characteristics of Aves are Statements 1 and 4. However, since we need to choose one, Statement 4 ("The beak had teeth") is the most definitive incorrect statement regarding Aves.

### Final Answer:
- The character that does not fit for Aves is: **"The beak had teeth."**