Re allopreening: strangely I have only ever observed this among some
critically endangered Bali Myna at the Hong Kong Aviary:
http://suan-yong.com/hong-kong.php?s=Aviary=21442
What I found more fascinating than the allopreening was that the bird on
the left had the muscular dexterity to lift
It's called "allopreening," and it's common among crow family members. I have
some photos and a little video of it at
https://get.google.com/albumarchive/101683745969614096883/album/AF1QipOTOn8uYT5okqlVFuupJF3oZ9GirfXeONgUKOYY
All members of the genus Corvus allopreen, so far as I know. Oddly,
