The Fly Brothers

Flies are characters seen in A Bug's Life. While sitting in the audience at P.T. Flea's circus, two flies mistakenly flirt with Francis believing him to be a girl. Annoyed by this, Francis picked a fight with them saying that they had been "buzzing around a dung heap all day!". The flies later find Francis and the other circus bugs at the Bug Bar looking for payback, and they bring with them an overlarged horse-fly friend named Thud. Francis attempts to get rid of them by playing a Robin Hood act with Slim and Heimlich, but they don't fall for it. However Flik, who was in the bar looking for warriors, sees this as a sign that they are real and invites them to go to Ant Island (but doesn't see the whole incident because he is forced outside by the crowd). The flies were last seen waking up after being unconscious as the circus bugs quickly go with Flik to escape an inevitable beating from them.

Trivia

 * Thud is a boss character in the video game for A Bug's Life.