Strix uralensis - длиннохвостая неясыть
First I heard a loud "meowww!!" coming from the other side of the creek near our cabin. The creek is actually a 10-meter wide tussock swamp in summer, so I wondered - how did the cat get there? (there was a silly white cat living with us in the house). The meowing continued, and I saw a shadow of a large bird move between trees, then another; and only then I realized what was going on:
a squirrel found a pair of owls during their daytime rest and started screaming at them, making this weird, cat-like loud sound. I'd never have guessed a squirrel was able to produce such sounds but I'd read about that in an artcle by Oleg Kosterin, our local ecologist. The screaming soon attracted a nutcracker, and something totally awful started - the bird called for backup, and in a minute there was an impossibly loud crowd of nutcrackers circling around the owls and harassing them, and the squirrel kept howling, too; the poor owls didn't know what to do and finally fled in about ten minutes.