Everyone knows that some bird species periodically fly south. This is quite a familiar phenomenon, and many of us do not think about what drives the birds to Africa and Asia and, most importantly, what makes them come back.
Why birds fly away is easy to guess: it gets cold, insects and worms disappear, and there is nothing to eat. So the birds are forced to fly away. The same ones that can prey on sleeping larvae or eat seeds remain.
It is a known fact that captive birds, when the time of migration comes, begin to worry. They have enough to eat, but they rush off to fly somewhere. This shows that migration is not the desire of each particular bird, but the instinct formed over millennia. The birds of our latitudes have migrated to us mainly from Africa and Asia. They have settled in northern latitudes, but the memory of their home has remained on a genetic level.
Let's ask ourselves a more complicated question: why do birds return to northern latitudes, because it's so good in the south!?
The fact is that northern birds cannot breed in the southern latitudes, they are not adapted for it. That's why every spring they come back, weave nests, raise their offspring, and fly south again.
