They both work oftenly to lock and aim at the targets, they are usually laid-back and similar of interest that's why they don't mind each other that much. While they tell stories and get along, there is still clear difference between them. Bird has black wings and a tail similar to a crow's, while Mafia has none. They also have different past and intentions, but that's that, they just work and snipe. But in the end, they both are also friends that hang out and talk to each other.