Hooded Siskin

Fascinating facts about the Hooded Siskin

• At just 10–12 cm long and about 11 g weight, the hooded siskin’s male plumage has a black hood topped with a bright yellow collar.
• While most hooded siskons stay put, the subspecies S. m. tucumanus embarks on a seasonal trek: it breeds high in north-western Argentina, then in winter slides down the slopes and even drifts northward into Bolivia, showing a rare migratory twist in an otherwise nomadic species.
• In the non-breeding season, these birds can gather in mixed-species flocks of up to 13 individuals, sometimes sharing the air with seven different finch species, turning open fields into a bustling aerial marketplace of seeds and chatter.
• Their nests are tiny open cups built up to about 4 m (13 ft) high on trees or even human structures, using thin twigs and spider silk, and they incubate a clutch of three or four speckled eggs for roughly 13 days before the chicks fledge after another 16 days.
• Despite an enormous range that spans sea level to 5,000 m (16,000 ft) across every mainland South American country except French Guiana and Suriname, the hooded siskon is listed as Least Concern, yet illegal trapping for the pet trade in Argentina shows that even widespread birds can face hidden pressures.

At a glance

About the Hooded Siskin

The hooded siskin (Spinus magellanicus) is a diminutive finch, just 10–12 cm long and weighing about 11 g, yet it carries a striking palette. Males of the nominate form wear a glossy black hood that sweeps over the head, throat and upper breast, framed by a vivid yellow collar on the nape and bright yellow rump, while the rest of the back and scapulars are olive-green with subtle streaks. Their wings flash with bands of black and yellow, and the tail is predominantly black edged with deep yellow on all but the innermost feathers. Females, by contrast, are cloaked in dull olive-green with grayish tones and lack the black hood, their plumage softened by yellow-green rump and greenish-gray underparts. Across its 12 recognized subspecies, these colors shift, some males display broader white edges on flight feathers, others a greener back or a reduced black hood, creating a mosaic of regional accents. Across the Andes, the Amazon lowlands, the Patagonian steppe and even the Polylepis forests of northern Chile, the hooded siskin thrives in an astonishing array of habitats: from dense lowland and montane forests to savannas dotted with solitary trees, cocoa and palm plantations, scrubby edges of cultivated fields, and suburban gardens. Though largely non-migratory, populations are highly nomadic, wandering in search of seed abundances. Their diet is a veritable buffet of tiny seeds, buds, flowers, nectar, fruits and small arthropods, and they even swallow sand to aid digestion. In the non-breeding season they form loose flocks of up to thirteen birds, often mixing with up to seven other siskin species. A surprising trait is their propensity to hybridise, not only with wild relatives where ranges overlap, but also in captivity with domestic canaries and other finches, blurring the lines of species identity in the wild.

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