In dramatic structure, dialogue is used to reveal information and move the plot.
narrate the events of a story.
describe the characters and setting.
make a play more like a novel.

Which revision, if any, best fixes the bolded (capitalized in this case) part of the sentence? female cardinals, a somewhat drab bird compared to the males, blend in well with their environment. no change somewhat drab birds a somewhat drab's bird somewhat drab bird's