There are three major groups with over 10 million people: Hausa-Fulani in the north, Yoruba in the southwest, and the Igbos in the southeast. These three dominate the regions in which they are found. There are basically two types of Nigerians: the Nilotic Africans (Arab-type) and the Negroes. Each of the ethnic groups fall into these two groups.
Of the 250 linguistic groups that make up the 90 million people that live in Nigeria, not less than 50% of them are Hausa-Fulani, Yorubas, or Igbos.
This group is found predominantly in Sokoto, Katsina, Kano, Bauchi, and Kaduna states. Some Fulanis are found in Gongola and Plateau states.
They are basically Muslims, and their culture has been influenced greatly by their religion. However, they still observe a lot of their age long tradition like the test of manhood among the nomadic Fulani, called Sharo, and the giving away for marriage of young girls...some hardly teenagers.
This group occupies the states in the southwestern part of Nigeria, such as Lagos, Ogun, Osun, Ekiti, Oyo, Ondo, and part of Edo, Kwara and Kogi states. They are highly urbanized people with a culture. They accept Ile-Ife as their ancestral house and have a very strong bond of kinship.
This group is found in Anambra, Imo, Abia, Enugu, Ebonyi and part of Delta State. They are known for their hard work and resourcefulness. Some are farmers, but today a significant number of them are now known to be traders.
This group is found in Benin (Edo) state. The Itsekiris, Isokos, and the Urhobos are found in Delta state.
This group (also known as the Izons) is found in the riverine areas of Ondo, Delta, Rivers and Bayelsa states. They are basically fishers, and their homes are made with stilts over water.
This group is found principally in mainland Akwa Ibom, while the Efik are found in the Cross River state.
This group is concentrated in Borno state. They have a long history and tradition as old as that of the Fulanis, only at the opposite end of the country.
This group is basically made up of war-like people, and they are found in Gongola and Benue states.
This group is found along the valley while the Berom are natives in Jos and Plateau states.
This group is found in Niger state, while the Gwaris are found in Niger and Kaduna states. The Igalas are found in Benue and Kwara states. There are many other smaller groups who are identified with either their tribal marks or their mode of dressing, but with modernization and inter-tribal marriage, the unity of the country is indeed in diversity.