It's amazing how quick they go from being a dot in the sky to close up.
I really like 'small in the frame' images of wildlife. For me, it puts the animal in the context of it's environment and therefore tells more of a story than a frame filling image. Both have their place in wildlife photography, and the two combined make a powerful portfolio.
So with that in mind I wanted to use the opportunity of taking photos of the eagles as they approached the boat. Having some 'interest' in the background, whether it be a hillside or dramatic clouds in the sky, is key. For me, images of birds in flight with a monotone background don't work as well.