窗台上的小鸟

灵感来源于下图：

from turtle import *
pensize(4)
for i in range(4):
    fd(200)
    rt(90)

pensize(4)
goto(40, -40)
goto(40, -160)
goto(0, -200)

pu()
goto(0, -10)
pensize(1)
pd()
goto(30, -40)
goto(30, -160)
goto(0, -190)

pu()
goto(200, 0)
pd()
pensize(4)
goto(160, -40)
goto(160, -160)
goto(200, -200)

pu()
goto(200, -10)
pd()
pensize(1)
goto(170, -40)
goto(170, -160)
goto(200, -190)

# 180/10
# 120/10
for i in range(10):
    pu()
    goto(0, -10 - 18 * i)
    pd()
    goto(30, -40 - 12 * i)

for i in range(10):
    pu()
    goto(200, -10 - 18 * i)
    pd()
    goto(170, -40 - 12 * i)

pu()
goto(20, -180)
pd()
pensize(4)
goto(180, -180)
ht()
pu()
goto(110,-160)
addshape('bird.gif')
shape('bird.gif')
st()

运行结果如下：