Crows, a sociable lot

Bird behaviour is a fascinating subject.
You can study an individual, a pair or a group of birds.
The last weeks I've discussed senses and bird behaviour.
Just look on Twitter for #BirdSenseSmell and #BirdSenseTaste.
Areas which are just barely being touched by science and still have a lot
of mysteries.
This week the subject will be the behaviour of crows, member of the Corvidae family, which are very sociable birds with strong communication skills. It's not only craaa !!
What do we know of the crow's behaviour, which research groups are there and what are still mysteries?
I will focus on the carrion crow, a common bird in my country The Netherlands and Europe.

Tune in on Twitter and Facebook where I will daily tweet /post this week.