One of the reasons so many Long-eared Owls, and for that matter Common Buzzards, winter in northern Serbia is that there is LOTS of food. For example, the Steppe Mouse Mus spicilegus is abundant. Fallow fields, harvested crop fields and grasslands are dotted with their storage mounds which can contain up to 10kg of grain and be around a metre in diameter. Here is a photo of one taken near Zrenjanin in the Banat region.
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