The cock crows at the dawn of the last day, when the last battle shall begin, first to crow is for the giants.
Voluspa - Norse Mythology Book - Verse 42
“ On a hill there sat, | and smote on his harp,
Eggther the joyous, | the giants’ warder;
Above him the cock | in the bird-wood crowed,
Fair and red | did Fjalar stand.”