sentences:  The dominant habitat types are the grassy savanna in the north with transition to the varying thin forests in the south.Based on ecological characteristics and climatic conditions, the country is divided under three bio-climatic zones namely, the Sahelian Zone, the Sudanian Zone and the Sudano-Guinean Zone.The Sahelian Zone covers 25% of the area of the northern part of the country, which is further subdivided under the Sahelian and sub-Sahelian sectors.