On Sun, 4 Nov 2012 11:30:19 +0000, David Boyd <[log in to unmask]> wrote:
>Is it certain that it's a bird - foxes for example and even domestic cats
>can make some bloodcurdling noises.
Definitely off topic here and I'm dating myself but in the 60s in the U.S.
there was a syndicated show filmed at the San Diego Zoo called "Zoorama."
The opening had a section where there was some weird bird call. They did a
segment on one show where they revealed the culprit. It was about a species
of monkey who made the calls using their armpits.