On a 6 night safari to Zakouma you're likely to see in the region of 35 species of large mammals – much "classic" big game occurs here – buffalo, lion, leopard, cheetah, serval, caracal, hyena, elephant, giraffe, roan, hartebeest, warthog, bushbuck, duiker, gazelle, oribi, waterbuck, kob, roan, kudu, monkey, civet, genet, mongooses, baboon – and some of these will be specific to the region (eg Lelwel Hartebeest, Buffon's Kob, Kordofan Giraffe). So many of these will likely be new if you haven't ventured in to the Sahelian region before.
As with any safari you won't see everything – such is the nature of the game. However, one of the many interesting things about Zakouma is how some species that occur in low densities elsewhere are remarkably common here, good examples of this are Roan and Honey-badger.
The Elephant of Zakouma almost exclusively live in one humongous super-herd, this is a mixed blessing in terms of sightings as if seen it is an awesome sight but it does mean that they are not an omni-present part of the horizon as they are in some places.
The bird life is both prolific and varied – a conservative estimate for a competent birder not fixating on finding new species would be at total of 125 species in a week – roughly a fifth of which would be new. The numbers of waterbirds are probably as much of a draw as the specials - aside from Flamingoes there is no other concentration like it in Africa.
While Zakouma is in places like other parks it has its own unique landscapes and the desert influenced culture of the people is more akin to North Africa than the East or South.
Part of the attraction of visiting Chad is undoubtedly the fact that you are very unlikely to see any other tourists.
Posted by: Alex