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

Swallows and swifts do this. Cuckoos fly during the night and rest and feed during the day. Swimming birds can fly both during the day and night, in complete ______.