Hi Ben - interesting to see a mention of Cape Verde in the birding context. I've visited three of the islands for the (excellent) sport fishing and had the pleasure of seeing Cape Verde shearwater, brown booby, tropicbird, kestrel and buzzard. I've told myself that if I go back I need to bring a pair of binoculars and make a serious effort at finding the madens peregrine. I see you've noted this is a "lower probability" target - how difficult are they to see in your experience? I was able to see Barbarys reasonably well in the Canary Islands but obviously things might be different further south...