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From late autumn to winter. From winter to spring. From autumn through the winter to whole spring. From late autumn through the winter to early sprin
there was not enough food there in the winter there were too many birds there were too many glaciers there was too much daylight
stopped migrating continued migrating began migrating again migrated south and stay there
Moving from one place to another with the season. Living in burrows in winter. Traveling in the winter months. Leaving one’s own country for another.
increase their activity in lower temperatures leave cold climates during winter remain dormant(休眠的) through periods of cold weather construct insulated hives
stopped migrating continued migrating began migrating again migrated south and stay there
To test the relationship between daylight and a disease of the glands common to birds. To test the relationship between daylight and migration. To test the relationship between migration and temperature. To test the relationship between daylight and changes in the season.
there was not enough food there in the winter there were too many birds there were too many glaciers there was too much daylight
birds should migrate in the middle of the winter longer days cause changes in the bodies of birds seasonal changes in the length of days do not affect migration increasing daylight increases the distance of migration
Moving from one place to another with the season. Living in burrows in winter. Traveling in the winter months. Leaving one’s own country for another.
stopped migrating continued migrating began migrating again migrated south and stay there
exact reasons for migration are not known birds migrate because of changes in temperature the ancestral home of all birds was the tropics glaciers caused birds to migrate
To test the relationship between daylight and a disease of the glands common to birds. To test the relationship between daylight and migration. To test the relationship between migration and temperature. To test the relationship between daylight and changes in the season.
there was not enough food there in the winter there were too many birds there were too many glaciers there was too much daylight
birds should migrate in the middle of the winter longer days cause changes in the bodies of birds seasonal changes in the length of days do not affect migration increasing daylight increases the distance of migration
birds should migrate in the middle of the winter longer days cause changes in the bodies of birds seasonal changes in the length of days do not affect migration increasing daylight increases the distance of migration
birds should migrate in the middle of the winter longer days cause changes in the bodies of birds seasonal changes in the length of days do not affect migration increasing daylight increases the distance of migration
there was not enough food there in the winter there were too many birds there were too many glaciers there was too much daylight
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