How to Pluralize João-de-Barro: Grammar Rules Explained

The plural of joão-de-barro is joões-de-barro, according to Portuguese grammar rules for compound nouns. The correct form applies pluralization only to the first element, "joão," which becomes "joões." The rule stems from the word's structure, where two nouns are linked by the preposition "de." In such compounds, only the first noun receives the plural mark, leaving "de barro" unchanged, as seen in similar terms like "pés de moleque." The name references the bird's clay nest-building behavior, and its scientific name is Furnarius rufus. However, not all compound nouns follow this rule, as pluralization varies depending on their specific elements.