41. The scientists divided the state into eight ecoregions and identified the primary migration routes in each. 42. The researchers conclude that the tools were used by hunters who were following game migration routes . 43. Bird migration routes have been studied by a variety of techniques including the oldest, marking. 44. Porkkala is also on one of the main bird migration routes in the Baltic Sea region. 45. The island overlooks one of the great whale migration routes , most notably for humpback whales. 46. In some areas, migration routes have changed due to changes in habitat and food sources. 47. Poda is located along Europe's second largest bird migration route , the Via Pontica. 48. The ancestors of the Delaware Nation, following a different migration route , settled in Anadarko. 49. It is a major migration route for Pacific chinook salmon that spawn in the Selway River. 50. Geographical features affect the migration route .
