This is an interesting video: https://www.facebook.com/video.php?v=10152054591023908
Can't decide if it was really just 'surfing' or trying to get the thing stable.
Brilliant, just shows how inteligent they are.
Incredible video clip! I know that some biologists don't like the term 'play' - Chris Packham would be one - but what else can this behaviour be? There's no reward involved, no food. Surely this crow is just experimenting for, dare I say it, 'fun'.