Across
- 2. Adaptation of wing feathers which reduces noise during flight.
- 5. The yellow glow of fireflies is caused by what biological phenomena?
- 6. A star used by explorers as a guide often called the North Star.
Down
- 1. A part of the eye that can sense light.
- 3. Another word for dusk and dawn.
- 4. A group of bats is called a _________.