No, mostly it is from overuse of insecticides. They eat insects mostly and will only rarely eat rodents if insect food isn't available.
It is really common unfortunately, we use alternative methods of insect control as much as possible for just this reason.
My daughter loves the Tawnys, and used to read all about them even as a very young child. We went to the gold coast one time to a bird sanctuary when she was five, and they called for a volunteer to help feed a Tawny.
She was chosen but destroyed the guy's pre-prepared spiel when he asked her what type of bird it was.
She answered 'A tawny frogmouth' and he got halfway through his reply that "no, it is not an owl, but a Tawny... oh, you just said that..."
It threw him off for the rest of his presentation.
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