It's easy to confuse the two guest .

SCENE V. Capulet's orchard.

    Enter ROMEO and JULIET above, at the window

JULIET

    Wilt thou be gone? it is not yet near day:
    It was the nightingale, and not the lark,
    That pierced the fearful hollow of thine ear;
    Nightly she sings on yon pomegranate-tree:
    Believe me, love, it was the nightingale.

ROMEO

    It was the lark, the herald of the morn,
    No nightingale: look, love, what envious streaks
    Do lace the severing clouds in yonder east:
    Night's candles are burnt out, and jocund day
    Stands tiptoe on the misty mountain tops.
    I must be gone and live, or stay and die