Two Swans on the Pond

I have photographed dozens of animals but one of most frustrating has to be birds on water. In particular swans. You need the patience of a saint to capture them perfectly. It seems that every time I come across them on a pond like this they are in a great position, but by the time my camera is to my eye they either have turned their back on me or have their heads under the water. Still at least I got one of the swans in the right pose!