Об­ра­зуй­те от слова MOVE од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

In autumn you can see large flocks of birds flying from Russia to warmer countries. In spring, they come back to us. Migration is the periodic seasonal ______ of birds.