Red-winged Blackbird

Overview

A medium-sized icterid, 17–24 cm long. The adult male is glossy black with a sharply demarcated scarlet shoulder patch bordered below by a thin yellow band — the field mark from which both the English and scientific name come (phoeniceus meaning “crimson”). Females and immatures are streaky brown above and below with a pale supercilium, more closely resembling a large, dark sparrow; they can be cryptic in marsh vegetation.

The species is famously polygynous: a single male can hold a territory containing several nesting females. Males advertise from exposed perches over water with the distinctive “conk-la-ree!” song and a wing-spread display that flashes the red epaulets. Diet is broad — insects through the breeding season, seeds and grain at other times.

Why Tortuguero

Red-winged Blackbird in Costa Rica reaches only the most northerly Caribbean and Pacific lowland wetlands; it does not occur as a regular bird of the inland forest. The marsh edges of the Tortuguero canal system and the lagoons at the canal mouths offer the kind of open emergent-vegetation habitat the species requires. Numbers are small compared to the North American core range, which makes any sighting here a genuine local find rather than a guaranteed tick.

How to see them (honestly)

• Scan the reeds and emergent vegetation where the canals widen into open lagoons rather than the closed-canopy stretches.
• Listen for the rasping “conk-la-ree!” — it carries across open water.
• Best light is early morning when males display from the tallest available perch.
• Females in dense marsh grass are easy to dismiss as a sparrow; if a “sparrow” is sitting on a cattail in standing water in Tortuguero, look again.

Status note

Globally Least Concern, with an enormous and stable North American population. The Costa Rican populations sit at the very edge of the species’ range and are correspondingly small and localized. Local wetland loss — drainage, conversion to pasture — is the main pressure on these peripheral populations, which makes intact lagoon-edge marsh inside the park disproportionately valuable for them.