Masai Mara flies anger young lioness

This was taken on the Masai Mara in western Kenya in August 2011. This young lioness seemed to be annoyed at something but I couldn’t tell what it was. Then when I put my 70-200mm at 200mm up to my eye.
Well you can see what the problem was. Up till that I thought we had problems with mosquitoes. Thank goodness those flies like the smell of carrion better than our pit sticks.