| 41. | Wading and migratory birds were so prolific they darkened the skies.
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| 42. | It may be an extraterrestrial being, or simply disoriented migratory birds or bats.
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| 43. | The Kaipara is a migratory bird habitat of international significance.
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| 44. | Several species of migratory birds visit the reservoir during winter.
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| 45. | The virus is spread by mosquitoes that feed on infected migratory birds and animals.
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| 46. | He decided to fly south, like a backward migratory bird.
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| 47. | Migratory birds believed to spread the illness also arrive then.
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| 48. | The big mystery remains where the migratory birds became infected.
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| 49. | During winter, thousands of migratory birds flock in to island.
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| 50. | Three billion migratory birds from North America flock to the reserve during the winter.
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