1. The Walls of Benin (800-1400AD), in present day Edo State, are the longest ancient earthworks in the world, and probably the largest man-made structure on earth. They enclose 6500 square kilometers of community lands that connected about 500 communities. At over 16000km long, it was thought to be twice the length of the Great Wall of China, until it was announced in 2012 (after five years of meticulous measurement by Chinese surveyors) that the Great Wall is about 21,000km long.
2. The Yoruba tribe has the highest rate of twin births in the world. Igbo-Ora, a little town in Oyo state, has been nicknamed Twin capital of the World because of its unusually high rate of twins that is put as high as 158 twins per 1000 births.
In a video centred on twin births in Igbo-Ora, one of the locals boasted that every family in the town has at least one twin!
3. Africa’s oldest known boat is The Dufuna canoe which was discovered in Dufuna village, Yobe state, by a Fulani Herdsman in May 1987, while he dug a well. Various radio-carbon tests conducted in laboratories of reputable universities in Europe and America indicate that the canoe is over 8,000 years old, thus making it the oldest in Africa and 3rd oldest in the world. The discovery of the canoe has completely changed accepted theories of the history and sophistication of marine technology in Africa.
4. The Anambra waxbill, a small bird of many beautiful colours, is found only in Southern Nigeria and nowhere else on earth.
5. The Jos Plateau Indigobird, a small reddish-brown bird, is found nowhere else on the planet but Plateau state, Nigeria.
Source: