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The diet of the Northern Cardinals is highly varied, but consists mainly of seeds, insects, and berries. The young are fed mostly insects.
The male sings to defend his nesting territory and actively attacks intruders. In courtship, both male and female raise their heads high and sway back and forth while singing softly. Early in the breeding season, the male often feeds the female. The female sings mainly in the spring before nesting. The nest, which is an open cup built by the female, is typically hidden in dense vegetation 1 to 3 m above the ground, sometimes higher. The 3 to 4 (sometimes 2 or 5) eggs (whitish to pale bluish or greenish white marked with brown, purple, and gray) are incubated for 12 to 13 days, almost always by the female alone. Both parents feed the young, which leave the nest around 9 to 11 days after hatching. The male may continue to feed the fledglings as the female initiates a second brood. There may be two to three broods per year (rarely four).
(Kaufman 1996; AOU 1998; Dunn and Alderfer 2011)