Which of the following is not an adaptation associated with flight in birds?

Options

A. Pneumatic bones
B. Absence of Right ovary
C. Beaks
D. Air sacs in lungs

Answer

To determine which of the following options is not an adaptation associated with flight in birds, we will analyze each option provided:

1. **Pneumatic Bones**:
- Birds have hollow bones, known as pneumatic bones, which significantly reduce their body weight. This adaptation is crucial for flight, as lighter bones allow birds to achieve and maintain flight more easily.

2. **Absence of Right Ovary**:
- In female birds, the right ovary is typically rudimentary and non-functional. This adaptation also serves to reduce body weight, which is beneficial for flight. A lighter body allows for better aerodynamics and flight capability.

3. **Beaks**:
- Beaks are present in birds and serve various functions such as feeding and grooming. However, they are not directly related to the mechanics of flight. Birds can still fly without beaks, making this adaptation less relevant to flight.

4. **Air Sacs in Lungs**:
- Birds possess air sacs that help in respiration and also contribute to reducing body weight. These air sacs allow for a more efficient respiratory system, which is essential for sustaining flight, especially during high-energy activities.

After analyzing all the options, we conclude that the **beaks** are not an adaptation associated with flight in birds.

**Final Answer**: Beaks