Agelaius Link

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

: They typically breed in marshlands, wetlands, or grassy areas near water, with females building deep cup-shaped nests lashed to reeds like cattails. Species Profiles yellow-souldered blackbird revised recovery plan - FWS ECOS agelaius

: 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. The genus includes several species of New World

: Males are aggressively defensive, famously attacking much larger animals, including hawks, horses, and humans, if they approach the nesting site. : Unlike many other birds, male Red-winged Blackbirds

: They undergo a "thermoregulatory metamorphosis" over approximately 12 days , transitioning from an ectothermic-like state to being able to maintain their own body heat.

: Unlike many other birds, male Red-winged Blackbirds do not acquire their full adult plumage (glossy black with intense red/yellow patches) until their second year . In their first year, they often have an orange or streaked appearance. Breeding and Social Behavior