Birds use for navigation and direction

Options

A. Memory of earth features
B. Sun, moon and stars
C. Earth's magnetic field
D. All tha above.

Answer

### Step-by-Step Solution

1. **Understanding Bird Navigation**: Birds have a remarkable ability to navigate during migration, which is the process of traveling from one location to another, often over long distances. This ability is crucial for their survival as they seek suitable climates and food sources.

2. **Mechanisms of Navigation**:
- **Memory of Earth Features**: Birds can remember the topography and terrain of the areas they travel through. This memory helps them recognize landmarks and navigate accurately.
- **Celestial Navigation**: Birds use the sun, moon, and stars for orientation. They can determine directions based on the position of these celestial bodies, especially during migration.
- **Earth's Magnetic Field**: Birds are believed to have the ability to sense the Earth's magnetic field, which helps them determine their position and direction during flight.

3. **Conclusion**: Considering all the mechanisms discussed, birds utilize a combination of memory of earth features, celestial navigation (sun, moon, and stars), and the Earth's magnetic field for navigation. Therefore, the correct answer to the question is "all of the above."

### Final Answer: All of the above.

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