Zebu Facts. Zebu is one of the oldest breeds of cattle in the world. There are 75 different species of zebu that differ from one another by size, color and type of habitat which they inhabit.Zebus are the only type of cattle that lives in tropical rainforests.They can be also found in open plains.here are 75 different species of zebu that differ from one another by size, color and type of habitat which they inhabit. Zebus are the only type of cattle that lives in tropical rainforests. They can be also found in open plains.