How to ensure that migratory birds do not get lost?

How do migratory birds migrate without getting lost?

There is no conclusion yet.

It is said that the key gene-ADCY8 determines that bird migration can't get lost.

There is a popular view that birds' migration habits and the ability to distinguish between journeys are innate. When prehistoric times entered the fourth ice age, the climate on the earth was extremely cold, which made it difficult for birds to find food. In order to find food, birds must travel long distances regularly. In this way, year after year, from generation to generation, after a long evolutionary process, various migration habits are recorded in their genetic codes, and then passed down from generation to generation.

Some scientists believe that migratory birds observe and mark the terrain along the way during migration, just like we humans explore in the wild, and then rely on various familiar targets on the way back and forth to determine the route. However, some scholars have suggested that after a winter of ice and snow, how did these migratory birds find their original traces? Won't these marks be destroyed? Obviously, this problem is not that simple.

Some scientists try to explain the long journey of animals as the sixth sense of animals, and so do migratory birds, who rely on the sixth sense to shuttle back and forth between north and south. However, even the human sixth sense does not always appear. Why do birds have such accurate sixth sense?

Other scientists have suggested that migratory birds may have a biological clock, which can accurately calculate the sun's displacement, and can use the sun during the day and the stars at night for orientation. But some migratory birds can still fly normally on cloudy days or starry nights, which is undoubtedly a denial of this view.