List of Headings
- i The best explanation of why birds migrate
- ii The influence of weather on the migration route
- iii Physical characteristics that allow migration
- iv The main reason why birds migrate
- v The most convincing grounds for migration
- vi Research findings on how birds migrate
- vii Contrast between long and short distance migration
- viii Successful navigation despite lack of teaching
- ix Mysterious migration despite lack of teaching
Passage
Drag a heading to each paragraph.
1. Birds have many unique design features that enable them to perform such amazing feats of endurance. They are equipped with lightweight, hollow bones, intricately designed feathers providing both lift and thrust for rapid flight, navigation systems superior to any that man has developed, and an ingenious heat conserving design and waterproof plumage.
2. The fundamental reason that birds migrate is to find adequate food during the winter months when it is in short supply.
3. One puzzling fact is that many birds journey much further than would be necessary just to find food and good weather.
4. One of the greatest mysteries is how young birds know how to find the traditional wintering areas without parental guidance.
5. Mounting evidence has confirmed that birds use the positions of the sun and stars to obtain compass directions.
6. Nevertheless, all journeys involve considerable risk, and part of the skill in arriving safely is setting off at the right time. This means accurate weather forecasting, and utilizing favourable winds. Birds are adept at both.