Bird on a 'jet stream'

A lot to do today, so a quick run up Primrose Hill in the morning is probably the only chance I'll get to take a good picture.

I spend time trying to get the birds in shot, but they tend to stay close to the ground as it's windy.

Occasionally the braver, larger birds take a higher trajectory, which seems to have it's own atmospheric conditions. I watch them working really hard fighting against the wind.