This video is about long-eared owls.
Vroege Vogels TV in the Netherlands reports that this year, more long-eared owls than ever have been counted in Friesland province. 1740 owls at 143 resting places. Last winter, there had only been 800 birds.
Extremely probably, this is because 2014 has been a good year for rodents. Other owl species have profited from this as well. 90-95% of long-eared owl food are common voles. In a bad rodent year, they eat some small birds as well.