Andean Siskin
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Quick Facts
- Scientific Name: Spinus spinescens
- Spanish Name: Jilguero Andino
- Family: Fringillidae
- Known Nicknames: Andean Spinus, Northern Andean Siskin
- Average Length: 10–11.5 cm / 3.9–4.5 in
- Average Weight: 10–13 g / 0.35–0.46 oz
- Wingspan: 18–21 cm / 7.1–8.3 in
- Key Feature: Bright yellow underparts and rump contrasting with black cap and wings in males
- Primary Diet: Primarily Granivore
- Range: Andes of Colombia, Ecuador, Venezuela, and northern Peru
- Habitat: High-altitude cloud forest, shrubby paramo edges, and montane scrub
- Social Structure: Small flocks or pairs
- Nesting/Breeding: Tree or shrub forks in cup nests
- Conservation Status: Least Concern (LC)
- Population Trend: Stable
The Andean Siskin (*Spinus spinescens*) is a small, vibrantly colored finch native to the high-altitude cloud forests and paramo of the northern Andes. The male is particularly striking, with a bright yellow body contrasting sharply with a jet-black cap, wings, and tail, while the female is a more subdued olive-green with dark streaks. A unique characteristic is its sharply pointed bill, specialized for extracting seeds from tough composite flowers and conifer cones, and its agile, acrobatic feeding style often seen hanging upside down. Adding to its charm, this siskin has a lively, twittering song and a distinctive flight call, making it a spirited presence among the misty, moss-draped branches of its mountain home.
Fun Facts
The Andean Siskin has a quirky habit of hanging upside down like a tiny acrobat while foraging for seeds, often clinging to the undersides of thistle and dandelion heads. Its bright yellow plumage is so vivid that it was once believed to be a sign of the sun god’s favor in indigenous Andean folklore. Despite its small size, this bird performs a unique “butterfly flight” during courtship, fluttering its wings slowly and erratically to display its yellow patches. Remarkably, it can survive at altitudes over 4,000 meters, where oxygen is scarce, by having a higher concentration of hemoglobin in its blood than lowland finches.
Habitats & Distribution
The Andean Siskin is found along the northern Andes mountain range, with its primary distribution spanning from western Venezuela through Colombia and into northern Ecuador. It inhabits the high-altitude zone known as the páramo, as well as adjacent montane scrub, forest edges, and open grassy areas with scattered bushes. This species is typically observed between 2,000 and 3,700 meters in elevation, favoring environments with a mix of Polylepis woodlands, humid shrublands, and disturbed agricultural clearings. Its range is discontinuous, concentrated in the Sierra Nevada de Santa Marta and the Eastern, Central, and Western cordilleras of Colombia, with smaller populations in the Venezuelan Andes.
Behaviours & Reproduction
Andean Siskins are typically observed in small, fluid flocks outside the breeding season, often mixed with other finches. During reproduction, they form monogamous pairs, with males performing a courtship display that involves fluffing their yellow and black plumage, singing a rapid, warbling song, and chasing the female in short, fluttering flights. The female alone constructs a compact, cup-shaped nest, usually placed in a dense fork of a shrub or tree, woven from grasses, moss, and fine rootlets. She incubates a clutch of 2 to 4 pale blue eggs with sparse dark speckling for about 12 to 14 days, during which the male feeds her regularly. Both parents share feeding duties for the altricial chicks, which fledge after roughly 15 to 18 days. A unique aspect of their strategy is that pairs may raise a second brood in the same season if conditions permit, with the male sometimes continuing to feed the first fledglings while the female begins a new clutch.
Diet
The Andean Siskin is primarily a granivore, with its diet consisting almost entirely of a wide variety of small seeds, particularly those from grasses, weeds, and the cones of Andean alder and other highland trees. An interesting aspect of their feeding behavior is that they are highly specialized for foraging in the paramo and cloud forest canopies, often hanging upside-down like a chickadee to extract seeds from dangling seed heads and catkins. They also supplement their seed-based diet seasonally with small buds, tender shoots, and occasionally soft fruits or berries, but they rarely, if ever, consume insects, making them one of the strictest vegetarian finches in their high-altitude range.
Colors
The male Andean Siskin is primarily bright yellow with a black cap, black wings featuring bold yellow wing bars, and a black tail; females are duller olive-yellow with streaked underparts and less black on the head. Its most unique feature is the male’s sharply contrasting black-and-yellow pattern, which aids in species recognition in the high-altitude paramo and forest-edge habitats, but offers no specific camouflage adaptation against predators.
Distribution Map
Places linked to this species. A sighting is never guaranteed.
