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Food chains have producer organisms such as plants which produce their food from the sun using photosynthesis, there are also primary consumers like zebras, these primary consumers eat producer organisms like plants. Then there are secondary consumers that eat primary consumers (an example would be a lion).
The northern cardinal is a bird that feeds predominantly on grains and fruits (which come from plants), so the cardinal would be considered a primary consumer. Therefore, the northern cardinal is not a secondary consumer.