The answer to the Line of Keats Ode to a Nightingale __ I listen in CodyCross is DARKLING. CodyCross is an amusing word game. It is a word play game that challenges one's word knowledge in different categories and themes. If this clue had you baffled, you're not alone! Many of the puzzles in CodyCross are pretty tricky, but that's what makes the game so fun.