Birds on a Twig

Outside my window in Spain is a tree with a long curved bare branch, not much more than a twig. Every morning at dawn chorus time the birds come and land on this perch, usually only one at a time, but following each other in fairly rapid succession. Different birds - goldfinches, crossbills, blackcaps, greenfinches, others - and they stay for a minute or two, singing and moving around in a slightly agitated manner, before flying off. The thing that surprised me though was the fact that they always face the rising sun. Not a single bird ever lands and faces the other way, with his or her back to the sun. It is almost as if they are carrying out the 'Salute to the sun' which most Hindus (and others) perform in the Far East. I believe I have come across a certain form of behaviour which might indicate something - I'm not going to tell you what, because I'm writing a paper - and hopefully a Nobel Prize will follow eventually, when they realise what a tremendous insight I've given to Mankind.