Why is there no s on sheep?

The Word "sheep" is an example of an irregular plural in English. Unlike most nouns that form their plurals by adding an "s" or "es," "sheep" remains the same in both singular and plural forms. This peculiarity is rooted in Old English, where the Word "sceap" also had the same plural form. Thus, when referring to multiple sheep, the term does not change, maintaining its original form.