Scarlet Tanager

Overview

The scarlet tanager is a medium-sized songbird (16–17 cm, 23–38 g) with some of the most extreme plumage dimorphism in North American birds. Breeding males are brilliant scarlet-red with jet-black wings and tail — an unmistakable combination in the canopy. After breeding, males molt into a yellow-green plumage nearly identical to females, retaining only the black wings as a field mark. Females and fall males are olive-yellow above and below with dark wings; they closely resemble female summer tanagers and hepatic tanagers, but the combination of yellowish underparts, olive back, and dark (not brown) wings separates them with care.

Piranga olivacea belongs to the family Cardinalidae despite the name “tanager” — a taxonomic realignment based on molecular data that moved the four North American Piranga tanagers out of Thraupidae. The species is primarily insectivorous on the breeding grounds, gleaning caterpillars and beetles from the canopy foliage, and supplements with fruit during migration, particularly in the tropics.

Why Tortuguero

Tortuguero straddles the Caribbean lowland migration corridor through which scarlet tanagers funnel between their eastern North American breeding grounds and Andean wintering sites. The park’s tall humid forest canopy provides quality stopover habitat: abundant arthropods and fruit, shelter from weather systems that pile up against the Cordillera Central, and the forest interior that this species — a bird of forest interior, not edge — requires. Unlike many warblers that can refuel in disturbed second growth, scarlet tanagers show a preference for mature canopy during stopovers, making Tortuguero’s old-growth strips disproportionately important for the species.

How to see them (honestly)

• Present primarily in September–October (southbound) and April–May (northbound) — not a winter resident.
• Work the tall-canopy sections of forest interior trails in early morning; the species forages actively in mid- to upper canopy.
• Fall birds are olive-yellow — look for the dark blackish wings contrasting with the body, and the heavier build compared to warblers.
• Spring males can be stunning: a bright scarlet bird with black wings is hard to misidentify even at height in the canopy.
• Look for the species in fruiting trees and in mixed-species canopy flocks during migration windows.

Status note

Scarlet Tanager is globally Least Concern with a large population, but long-term Breeding Bird Survey data show gradual decline tied to forest fragmentation in the breeding range. The species requires interior forest of at least 10–12 hectares for viable breeding — small forest patches are largely unsuitable. Wintering habitat loss in the Andean foothills adds pressure at the other end of the migration. The intact forest canopy at Tortuguero represents precisely the stopover quality the species depends on during transit — functional old-growth strips that most of the Caribbean lowland corridor no longer offers.