 Numerous birds perch on bodies of large mammal herbivores or feed on the insects turned up by grazing mammals.The word "commensalism" is derived from the word "commensal", meaning "eating at the same table" in human social interaction, which in turn comes through French from the Medieval Latin "commensalis", meaning "sharing a table", from the prefix "com-", meaning "together", and "mensa", meaning "table" or "meal".Commensality, at the Oxford and the Cambridge Universities, refers to professors eating at the same table as students (as they live in the same "college").