This video from the USA says about itself:
Finding Uncommon Dragonfly Species
Mud Lake is a subalpine fen near Skalkaho Pass, Montana. Fens are infrequent, as such the community of species using this habitat are
uncommon to rare. I have visited this site several times looking for two particular dragonfly species found here: Lake Darner (Aeshna
eremita) and Subarctic Darner (Aeshna subarctica) [aka Bog Hawker]. This video captures the adventure and my happiness in finally finding and photographing them on September 9, 2013.
Translated from the Vlinderstichting in the Netherlands:
Monday, October 5th, 2015
In 2013 there already was a sighting of a bog hawker in the Kampina nature reserve in North Brabant province and this year they are seen again. That seems like this rare dragonfly is establishing itself there. They are otherwise only found in the northern half of the Netherlands.