Flying Bird.

float wing = 200;
void setup() {
  size(500, 500);
  strokeWeight(5);
}
void draw() {
  background(#FF1493);
  wing = mouseY;
  if (frameCount%30>10) {
    wing+=20;
  } else {
    wing-=70;
  }
  if (mouseY <= 250) {
    wing+= 10;
  } else {
    wing-= 60;
  }
  draw_bird(mouseX, mouseY);
}

//bird
void draw_bird(float x, float y) {
  int rx = 100;
  int ry = 100;
  fill(#000080);
  ellipse(x, y, rx, ry);
  fill(225);
  ellipse(x-10, y-10, rx-90, ry-90);
  ellipse(x+10, y-10, rx-90, ry-90);
  line(x+50, y, x+150, wing);
  line(x-50, y, x-150, wing);
   fill(#FFFF00);
  triangle(x, y+40, x-10, y+5, x+10, y+5);
}