actually i wanted to record the Capercaillie.
So i found the clip of the early morning, with the Great Bittern, were there more than one booming males?
8 minutes with fog-horn concert of Great Bittern
6:20

Heh
What do you think about Athene noctua, Little Owl or Kivikakk on this one? (not very familiar with them..)
Ok, owl anyway