The entire Park lies in the southern part of the southern Guinea Savannah. Several Botanists have classified the vegetation in the Park in different ways, but generally there are four sub-types.
These consist of dense woodland and forest outliers in the South-eastern part, mixed open savannah woodland in the central part; out crop vegetation in the northeast and riparian grassland and fringing woodland occupying the forest plains and valleys along the Ogun River. Some commonly found floral species in the Park include: Burkea africana, Vitaleria paradoxum, Combretum molle, Terminalia glaucescens, Kigelia africana, Hymenoccardia acida, Lophira lanceolata, Daniellia oliveri, Mytenus senegalenis, Parinari plyandra, Uapaca togoensis, Afselia africana, Vitex doniana, Anogeissus leiocarpus, Parkia biglobosa, Lacanoidiscus cupanoides, Lannea schimperi, etc.
For a very long period in the past, the area has suffered indiscriminate human activities including hunting. As a result, animal species have been greatly depleted and some species have either become locally extinct or rare. Nevertheless, several large mammal species are still common. These include Western Kob (Kobus kob), Roan Antelope (Hippotragus equines), Western Hartebeest (Alcelaphus buselaphus), Grimm’s Duiker (Sylvicarpra grimmia), Red Flanked Duiker (Cephalopus rufilatus), Oribi (Ourebia ourebi), Water Buck (Kobus defassa), Anubis Baboon (Papio anubis), Patas Monkey (Cercopithecus aethiops), Bush Buck (Tragelaphus sciptus), Buffalo (Syncerus caffer), Red River Hog (Potamochoerus porcus), Warthog (Phacochoerus aethiopicus), Lion (Panthera leo), etc. The Park is rich in both National and International migratory birds which could be watched by bird Watchers (tourists). Also abundant in the Park are Fishes, Reptiles, Butterflies, Ants, Mushroom, and Millipede etc.
The following animals could be easily sighted on a visit to the Park:
- Bush Buck
- Patas Monkey
- Western Hartebeest
- Ground squirrel
- Variety of butterflies
However, the following animals are not easily sighted; Buffalo, Lion, elephant, waterbuck, warthog, Red River Hog, Python etc.