The Cape Kestrel has an interesting design on the back.
The pics posted are excellent, but judging from your words you had lots of blurred ones too, which is very understandable

Thanks Lis, I'm not too happy with my pics but I think most people think their own pics are never good enough.
Yes, we saw a lot of different birds, and I didn't even get pics of all the different species.
Thanks Ex. This was my first proper experience with photographing birds in flight and I learnt a lot!
This is what Prions look like from a ship!