the Nightingale is though self centered easily persuaded. he easily gets tricked by the gloworm into not consuming it. the Nightingale at that night was hungry and looking for something to eat and sees the gloworm. he feels threatened by the gloworm when it says that it can stop the nightingale's song and finds something else to quiet it's hunger.
the gloworm is by the the acts of it an natural convincer. it takes its chances and confronts the hungry Nightingale. though the gloworm knows that the Nightingale won't be easily tricked it takes its risk.
also the gloworm is likely to not put himself down nor to please the gloworm. he sees itself worthy to be praised for it's glow.
