How call the female of Pygmy Owl from Bialowieza Forest?

For Pygmy Owl is no clear sexual dimorphism, only the female is slightly larger than the male. Today, filmed female Pygmy Owl in Białowieża Forest. How I can you be sure? Only female call like the bird in the movie. For a moment I saw 2 Pygmy Owls next to each other and the female is about 1/4 larger than the male. Bialowieza Forest spring begins to develop its wings 🙂

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