This is Amazing!!
Until now I never fully understood how to tell the difference between male and female birds. I always thought it had to be determined surgically - until now.

Below are 2 birds. Study them closely and see if you can spot which of the two is the female bird.

It can be done. Even by one with limited bird watching skills - try it.

And I'll give you one guess which of the Opp Knocker contributors provided this little diddy...