Mesmerising Bird Tornado "Millions of birds suddenly fill the sky!

Mesmerising Bird Tornado "Millions of birds suddenly fill the sky!

We were on holiday in Spain when we heard a strange sound outside the villa, we went out to see what was going on and Millions of birds were filling the sky! they seemed to be going around in circles like a tornado at times.
At the end of this video all the birds decided to leave at the same time, which made a sound like a large gust of wind, after that they all disappeared.
We could see them everywhere around us and miles away in the distance, it was a really Amazing experience, we just watching in amazement totally mesmerised by it. After all this is not something you see everyday, we were very glad we could get under cover though! :-D