Mystery bird...

On our walk this afternoon, we went through some crop fields where many cornflowers and camomile flowers are growing.  We spotted a pair of the most amazing little birds that seemed to be flitting from one stalk to another - kind of hovering, almost like humming birds.  I've never, ever seen one of these before and have no idea what they are.  It's a bit far off, but still... Maybe someone knows what it is?
:-)