There are currently three different views on why migratory birds migrate: ①Birds originated in the south. As the continental plate drifted from south to north, many birds were taken to the north, so their attempts to return to their homes in the south resulted in the formation of birds. The habit of migrating. ②Birds originated in high latitude areas. Quaternary glaciers invaded from north to south, forcing birds to migrate to the south. When the glaciers retreated in summer, the birds could periodically reciprocate between breeding grounds and wintering grounds, thus forming The act of migration. ③Birds originated from tropical forests in the south, and the mass reproduction of their populations caused an increase in food demand. Therefore, ecological pressure caused certain birds to spread to the retreat areas of the northern glaciers in summer, and then return to the south when the glaciers came. Overwintering, over a long period of time, they formed a behavior of regular migration. In comparison, the first point of view is somewhat suspicious. Because modern geological research shows that the obvious continental plate movement has been completed long before the emergence of birds. There is some evidence for the second view and the third view. But the third view is more in line with modern ecological thinking and seems more reasonable.
View more about Winged Migration reviews
