Iroko is a large hardwood tree from the west coast of tropical Africa that can live up to 500 years. The tree is known to the Yoruba tribe as ìrókò, logo or loko and is believed to have supernatural properties. Iroko is known to the Igbo people as oji wood. It is one of the woods sometimes referred to as African teak, although it is unrelated to the teak family. The wood colour is initially yellow but darkens to a richer reddish brown over time. It is yielded mostly (probably) by Milicia excelsa. In much of the literature on this timber the names of the trees that yields it are given as Chlorophora excelsa and Chlorophora regia. The tree is feared in some cultures where it originates and hence is shunned or revered with offerings. Yoruba people believe that the tree is inhabited by a spirit, and anybody who sees the Iroko-man face to face becomes insane and speedily dies. According to the Yoruba, any man who cuts down any Iroko tree causes devastating misfortune on himself and all of his family, although if they need to cut down the tree they can make a prayer afterwards to protect themselves. They also claim that the spirit of the Iroko can be heard in houses which use Iroko wood, as the spirit of the Iroko is trapped in the wood. In Nigeria the iroko wood is of much lower quality due to soil conditions as well as root-rot. Some Westerners refer to the wood as "poor man's teak".