How can you determine a bird’s sex?

“Until now I was never able to determine which was the male and which the female.

I always thought that it had to be determined surgically, while ornitholigsts spoke about the feathers, the size, the beak and other equally idiotic ways that required hours upon hours of observing them in their natural habitat and so on.

Until now…

Of two birds, which is the female?”

(continues in the attached Powerpoint slideshow)

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