There's a really interesting German comment there: > Frage ich mich, WER hier die Nachteule ist. "I wonder WHO is the owl here." So it seems that in German,

There's a really interesting German comment there: > Frage ich mich, WER hier die Nachteule ist. "I wonder WHO is the owl here." So it seems that in German, owls make the sound "WER", rather than "Hoo", but wer also means who in German. Allowing the same joke to work in German as in English. On the other hand, I can't find a reference to Wer being an owl sound, rather Owls say hoe-hoe in German. This suggests the possibility that the German comments are not actually by a German speaker, but an English speaker pretending to be German and using Google translate as part of the scheme.