ABSTRACT: The purpose of this research was to study the histology and describe microscopy findings epididymis epithelium greater Rhea americana at three time periods: November 2005 (n=14), December 2006 (n= 20), May 2007 observe compare differences that occurred. We studied from 54 rheas, bred in Santa Maria, Rio Grande do Sul, Brazil. were collected during commercial slaughter fixed bouin. Opt...