Flock birds.

int wing;
void setup() {
  size(500, 500);
  strokeWeight(5);
}
void draw() {
  background(#FF1493);
  wing = mouseY;
  if (frameCount%40>20) {
    wing+=40;
  } else {
    wing-=50;
  }
  if (mouseY > 0 && mouseY < 500) {
    wing+= 0;
  } else {
    wing-= 60;
  }
  draw_bird(mouseX, mouseY, 3, 3);
}

//bird
void draw_bird(float x, float y, int row, int flocks) {
  int rx = 10;
  int ry = 10;
  int mx = 0;
  int my = 0;
  int n = 0;
  int f = 0;
  int k = 70; //ค่าคงที่ ระยะห่างของแต่ละแถว
  while (n<row) {
    while (f < flocks) {
      fill(#000080);
      ellipse(x+mx, y+my, rx, ry); //หัว
      line(x+10+mx, y+my, x+20+mx, wing+my); //ปีกขวา
      line(x-10+mx, y+my, x-20+mx, wing+my); //ปีกซ้าย
      f++;
      mx += 150;
    }
    f=0;
    mx=k;
    k+=70;
    n++;
    my+=50;
  }
}