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.”

Bellows Translation