Bird Opening is a chess opening with the ECO code A02. It goes 1. f4. White opens with 1. f4 (Bird's move). After 1 move it is Black to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
In chessGM's opening book this position continues with 1... d5.
White starts with 1.f4, controlling e5. It is like a Dutch Defense with colours reversed and leads to kingside play.