摘要
Did you ever hear the cry of wild geese as they were flying south?They were on their way to warmer land.They were migrating.Geese fly in a pattern forming a V.Wild geese are the highest-flying birds in the world.Some have been known to fly as high as 29,000feet(9,000m).This distance is the highest ever recorded for birds.However,most birds remain under the clouds when they are migrating.
Did you ever hear the cry of wild geese as they were flying south？They were on their way to warmer land.They were migrating.Geese fly in a pattern forming a V.Wild geese are the highest-flying birds in the world.Some have been known to fly as high as 29,000feet（9,000m）.This distance is the highest ever recorded for birds.However,most birds remain under the clouds when they are migrating.
