Here's a small test. See if you can spot which of the two is the female bird.

[Danzig]

Here's a small test. Take a look at these two birds. Study them closely and watch their habits. See if you can spot which of the two is the female. It can be done. Even by one with no skills whatsoever in bird watching.

 

[jazz lady]

That is SOOOOOOOOOOO old. Everybody knows PFgal anyway.