The genus includes several species of New World blackbirds, most notably the widespread Red-winged Blackbird ( Agelaius phoeniceus ). These birds are known for their rapid development and highly territorial breeding habits. Developmental Stages
: Young typically leave the nest 10–14 days after hatching. They are fed by parents for another 2–3 weeks before becoming independent.
: Born altricial (naked and helpless), they possess one of the fastest avian growth rates , increasing their body mass by 9–10 times within the first few days.
: Males are aggressively defensive, famously attacking much larger animals, including hawks, horses, and humans, if they approach the nesting site.