This video says about itself:
Male Nathusius’ Pipistrelle Bat singing
12 September 2014
At a large mixed maternity roost of Nathusius’ and Soprano pipistrelles in Northern Ireland, the males are busy trying to attract females with their songs. This boy had the cheek to sit right at the entrance to the roost so all the females had to go past him. He was a pretty loud and frantic singer so he probably got lucky.
You can see him opening his mouth as he makes each noise, but the camera could not pick up the very high-pitched sounds that he made.
27 February 2015
You would not expect it, but bats also fly above the sea. Researchers have now shown that in the months of September and October they may even be found regularly in offshore wind farms. Probably the bats pass the windmills when they are migrating, but the researchers also conclude that they sometimes fly there from the continent to catch insects. Nathusius’ pipistrelle was most heard around the windmills, but signals were also heard from common noctule bats.
The study took place in two wind farms off the coast of Egmond.
New research at the University of Exeter and Bat Conservation Ireland has given the lie to the popular belief that streetlights are attractive to our common bat species because of the insect life they attract. The study found that in fact bat activity was lower in street-lit areas than in dark locations with similar habitat. And, in fact, the scientists have concluded bright lights are having a detrimental effect on bats: here.
Bats obey ‘traffic rules’ when foraging for food: here.