Flight feathers are

Options

A. Contours
B. Quills
C. Coverts
D. Filoplumes

Answer

To answer the question "Flight feathers are," we need to analyze the options provided and understand the characteristics of each type of feather mentioned.

### Step-by-Step Solution:

1. **Understanding Flight Feathers**:
- Flight feathers are specialized feathers that aid in the flying ability of birds. They are crucial for lift and maneuverability during flight.

2. **Analyzing the Options**:
- **Option A: Contours**:
- Contour feathers are the outer feathers that cover the body of the bird. They provide shape and protection but are not primarily responsible for flight.
- **Conclusion**: Incorrect option.

- **Option B: Quills**:
- Quills are larger feathers found in the wings and tail. They are specifically designed for flight, providing the necessary aerodynamic structure for birds to soar and navigate through the air.
- **Conclusion**: This is a strong candidate for the correct answer.

- **Option C: Coverts**:
- Coverts are small feathers that fill the gaps between the larger flight feathers (quills) on the wings and tail. While they play a supportive role, they do not function as primary flight feathers.
- **Conclusion**: Incorrect option.

- **Option D: Philoplumes**:
- Philoplumes are small, hair-like feathers that are found beneath the contour feathers. They are sensory in nature and do not contribute to flight.
- **Conclusion**: Incorrect option.

3. **Final Answer**:
- Based on the analysis, the correct answer to the question "Flight feathers are" is **Option B: Quills**.