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1. 1.

   Why is the migration of birds such an amazing phenomenon?

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   The migration of birds is such an amazing phenomenon because...

2. 2.

   What did early naturalists believe about the sudden disappearance and astounding reappearance of birds?

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   Early naturalists believed that the sudden disappearance and...

3. 3.

   By the time Salim Ali appeared on the scene, what had naturalists learnt?

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   By the time Salim Ali appeared on the scene, naturalists had...

4. 4.

   What has confused naturalists over the years?

5. 5.

   What do you understand by 'taught' behaviour'?

6. 6.

   If bird migration is not 'taught' behaviour, what causes it to happen regularly, year after year?