| 31. | This was an historic migration route for Khas people eastward in the late Middle Ages.
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| 32. | When hydro power plants were built the salmon spawning grounds and migration routes were destroyed.
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| 33. | The migration route is across the Torres Strait, travelling individually or in small groups.
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| 34. | Resident orcas leave the coast each fall; their migration routes are still relatively unknown.
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| 35. | This may be due to migration routes.
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| 36. | Monitoring programs count the number of monarchs in roosts that develop along the migration route.
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| 37. | Sailing against these natural migration routes would have been difficult in any ancient style boat.
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| 38. | It takes a pretty big storm to open migration routes to and from the spawning grounds.
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| 39. | They also were released along traditional migration routes of elk and deer, their natural prey.
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| 40. | Reasons may vary from the El Nino weather phenomenon to dry conditions along the migration route.
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