There are no true endemic species of bird in Kenya, but included in the 'Endemics and near-endemics' list are species with a distribution mainly restricted to Northwest Africa and the Iberian peninsula. Several of these are not generally seen as 'near-endemics' and hence 'restricted-range species' would probably have been a more appropriate term.
Birds listed under 'Birds of regional interest' are mainly species that are not easily seen in Europe, but are restricted to North Africa and the Middle East. Many of these birds are thus sought by the Western Palaearctic (WP) lister and European birder in general. They are listed here as 'regional specialities' although several are widely distributed in Africa south of the Sahara, or even in Asia. I apologize for being a little bit Europe centric here, but considering that the vast majority of birders visiting Kenya are Europeans this does make sense.
In the final list, 'Birds of national interest', I have included species that are generally more widely distributed but that could still be considered to be of interest to the visiting birder.