This video says about itself:
Large Crane Flies Mating
20 January 2014
The Crane Fly has a number of different nicknames around the world including mosquito eater and gallinipper. There are over 4,000 different species of crane fly in the world that have been identified at this time, making them the largest family within their genus. The winged adult crane flies usually do not eat, and spend their brief time mating and laying eggs.
Dutch entomologists report (translated):
Sunday, November 23, 2014
Because of the very favourable weather conditions this year leatherjackets, the larvae of crane flies, are already strikingly large and come with hundreds of specimens per square meter in grasslands. 2014 is the fifth year in a row with many crane fly larvae. Various birds will benefit in the coming time.