See all posts in the Birds of Carver County series
The Pine Siskin (Spinus pinus) is a small, lively finch native to North America. Found in coniferous and mixed forests, these birds are highly social and often seen in flocks, particularly during the non-breeding seasons.
Pine Siskins are small, measuring about five inches in length, with a shape almost identical to American Goldfinches. Travelling in flocks, they often will come to feeders in the company of goldfinches.
Their overall appearance is brown with flashes of yellow in their wings and tail, so more than a glance might be required to notice them among their cousins. Their streaky breasts may also cause identification confusion with female House Finches and Purple Finches. Males and females mostly look the same.
Pine Siskins have slender pointed bills adapted for extracting seeds from cones. Their diet primarily consists of seeds from conifers such as spruce, fir and pine, though they also feed on alder, birch and weeds. Occasionally, they consume insects, especially during the breeding season when protein is essential for raising young. A high-pitched rising buzzy zreeeeee call might alert you to their presence in nearby trees.
One of the most fascinating traits of Pine Siskins is their erratic migratory behavior. Unlike many birds with predictable migration patterns, Pine Siskins are irruptive migrants. This means their movements are probably driven by food availability rather than seasonal changes.
In years when seed supplies are low in their northern habitats, large numbers of Pine Siskins may appear far south of their usual winter range, which includes Minnesota and Carver County. This winter, they have not yet appeared at the author’s yard.
Pine Siskins are hardy birds, well-adapted to cold environments. They can increase their metabolic rate by up to 40% during winter, allowing them to survive harsh temperatures. Additionally, their communal nature helps them stay warm as they roost together.
Breeding typically occurs from May to August, with females constructing cup-shaped nests in conifer trees. They lay three to five eggs, which hatch after about two weeks of incubation. Nesting in Carver County is not commonly seen.
Pine Siskins play a crucial role in seed dispersal and are a joy to observe in the wild or at feeders stocked with thistle or sunflower seeds. Their resilience and adaptability make them a fascinating subject for bird enthusiasts and nature lovers alike. Population declines have been noticed, but causes are difficult to identify due to the species’ erratic seasonal movements.
For more information:
- The Sibley Guide to Birds, David Allen Sibley
- Birds of Minnesota, Robert B. Janssen
- The Breeding Birds of Minnesota, Pfannmuller, Niemi, + Green
- Birds of the World, Cornell Lab of Ornithology
Online: Pine Siskin Overview, All About Birds, Cornell Lab of Ornithology
