Chestnut-backed Tanager
Stilpnia preciosa
Order: Passeriformes / Family: Thraupidae
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About the Chestnut-backed Tanager
The Chestnut-backed Tanager (Stilpnia preciosa) is a dazzling representative of the family Thraupidae, known for its lush plumage and vibrant presence in the forests of South America. This species primarily inhabits the Atlantic Forest biome, which stretches across southeastern Brazil, eastern Paraguay, and northeastern Argentina. Its existence in these rich, biodiverse ecosystems underscores the importance of preserving these areas, as they host a multitude of unique species.
Regarded as an important seed disperser, the Chestnut-backed Tanager contributes significantly to the ecological dynamics of its habitat. By consuming a variety of fruits and subsequently passing the seeds through its digestive system, it aids in the propagation and genetic diversity of plant species in its ecosystem. Such roles are crucial, especially in fragmented landscapes where natural seed dispersal mechanisms may be disrupted.
Seasonal behaviors of the Chestnut-backed Tanager include slight altitudinal shifts in response to food availability. During breeding seasons, they are more often found in dense forest interiors, where the protective cover supports nesting and rearing of young. Outside the breeding season, they may venture into semi-open areas, taking advantage of seasonal fruiting events. This adaptability in habitat preference reflects their resilience to some degree of environmental change.
The Chestnut-backed Tanager's vibrant coloration and active foraging behavior make it a favorite among birdwatchers in its range. Its presence serves as an indicator of healthy forest ecosystems, where it participates in complex interactions with other species, from insects to mammals, creating a tapestry of life that sustains the region's ecological balance.
The Chestnut-backed Tanager belongs to the family Thraupidae, within the order Passeriformes. These birds typically live average 5-8 years, with a max recorded at 9 years..
How to Identify a Chestnut-backed Tanager
Adult Chestnut-backed Tanagers are easily recognizable by their stunning chestnut back, contrasting with a turquoise blue head, nape, and underparts. Their wings and tail are a darker blue, creating a striking visual effect that helps distinguish them from other tanagers. Males and females are similar in appearance, though females may exhibit slightly duller hues.
Juvenile Chestnut-backed Tanagers differ from adults by having a more muted coloration, with paler underparts and a less defined chestnut back. These differences in plumage can make it challenging to identify young birds, especially when mixed with flocks of other tanager species.
In flight, the Chestnut-backed Tanager displays a rapid, undulating pattern typical of tanagers, with quick wingbeats followed by short glides. When perching, they often adopt an upright posture, which accentuates their elegant plumage. While foraging, they can be seen moving briskly through the canopy, often in the company of mixed-species flocks, which adds to the challenge of distinguishing them from similarly sized and colored tanagers.
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Chestnut-backed Tanager Habitat and Range
Preferred Habitat
The primary habitat of the Chestnut-backed Tanager is the humid Atlantic Forest, a region characterized by high biodiversity and endemism. This forest type extends through southeastern Brazil, eastern Paraguay, and northeastern Argentina. They favor areas with dense canopy cover, where the availability of fruiting trees is high.
Typically found at elevations ranging from sea level up to 1200 meters, they show a preference for lower montane forests and occasionally venture into subtropical or tropical moist lowland forests. Seasonal shifts in habitat use are notable, with movements into more open areas during non-breeding seasons, where food resources may be more abundant.
While primarily a forest dweller, the Chestnut-backed Tanager is occasionally observed in gardens and parks in urban settings, provided there are sufficient trees and shrubs to support their dietary and nesting needs. Such adaptability allows them to occupy both rural and semi-urbanized landscapes, although their presence is predominantly tied to forested environments.
Geographic Range
The range of the Chestnut-backed Tanager is confined to the Atlantic Forest regions of South America. This includes southeastern Brazil, where they are prevalent in states like São Paulo, Rio de Janeiro, and Minas Gerais, as well as eastern Paraguay and northeastern Argentina, particularly in the Misiones province.
Within this range, they are largely non-migratory, maintaining territories that shift slightly with the seasons. During breeding periods, they remain in the forest interior, but outside this time, they may move altitudinally or laterally in search of food.
The population density of the Chestnut-backed Tanager is highest in areas where the forest canopy remains intact, as these provide the necessary resources for feeding and breeding. Despite pressures from deforestation and habitat fragmentation, they remain relatively widespread within the remaining fragments of their range, although their numbers are more concentrated in protected areas and reserves.
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What Does the Chestnut-backed Tanager Eat?
The Chestnut-backed Tanager primarily feeds on a variety of fruits, which constitute the bulk of its diet. These fruits are sourced from native forest trees and shrubs, such as those in the genera Miconia and Cecropia, which are abundant in their natural habitats.
In addition to fruits, this tanager supplements its diet with insects, providing essential proteins, especially during the breeding season when energy demands are higher. Foraging occurs mostly in the mid to upper canopy, where they deftly pick off ripe fruits and small arthropods.
Throughout the year, the diet of the Chestnut-backed Tanager may vary slightly in response to the availability of different food sources. During periods when fruit is scarce, they increase their intake of insects and other invertebrates. Their feeding schedule generally sees them most active during the early morning and late afternoon, avoiding the midday heat.
Want to attract Chestnut-backed Tanagers to your yard? See our recommended feeders and seed types for the best results.
Chestnut-backed Tanager Behavior and Social Structure
Chestnut-backed Tanagers exhibit social behaviors typical of many tanager species, often forming small groups or joining mixed-species flocks. These flocks can include other tanagers, vireos, and warblers, facilitating efficient foraging by reducing individual vigilance while increasing the chances of locating food.
Territorial behavior is most pronounced during the breeding season, when pairs establish and defend nesting territories within the dense forest. Courtship displays involve males showcasing their plumage through exaggerated postures and vocalizations.
In response to predators, the Chestnut-backed Tanager relies on its agility and the dense cover of foliage. Alarm calls are sharp and serve to alert conspecifics and other nearby birds. Daily activity patterns see them most active in the cooler parts of the day, engaging in foraging and social interactions, while resting during the midday heat.
Chestnut-backed Tanager Nesting and Reproduction
The nesting habits of the Chestnut-backed Tanager typically see them constructing cup-shaped nests in the dense foliage of forest trees. These nests are crafted using a variety of natural materials such as twigs, moss, and leaves, providing both camouflage and protection.
Preferred nesting sites are often well concealed among the branches, which helps in deterring predators. The typical clutch size ranges from two to three eggs, which are incubated primarily by the female for about 12-14 days.
After hatching, both parents participate in feeding the chicks, bringing a mix of fruits and insects. The fledging period lasts approximately 14-16 days, after which the young birds leave the nest but remain dependent on their parents for some time. Typically, the Chestnut-backed Tanager raises one brood per year, although favorable conditions may allow for a second.
Chestnut-backed Tanager Sounds and Vocalizations
The primary song of the Chestnut-backed Tanager is a series of clear, melodious notes that rise and fall in pitch. This song is often delivered from a high perch and is used for both mate attraction and territory defense.
Call notes are sharp and metallic, serving as contact calls within flocks. Alarm calls, on the other hand, are more abrupt and harsher in tone, intended to warn of nearby threats. During the dawn chorus, their songs can be heard blending with those of other forest birds, creating a rich tapestry of sound typical of these biodiverse habitats.
Interesting Facts About the Chestnut-backed Tanager
- 1The Chestnut-backed Tanager was first described by the German ornithologist Jean Cabanis in 1850.
- 2Despite their vibrant colors, Chestnut-backed Tanagers can be surprisingly difficult to spot in the dense forest undergrowth.
- 3This species is monogamous, with pairs often staying together beyond the breeding season.
- 4The Chestnut-backed Tanager's diet is predominantly frugivorous, yet they are skilled insect hunters, especially during chick-rearing.
- 5They play a crucial role in seed dispersal for many plant species, aiding in forest regeneration.
- 6Their nests are often placed high in the canopy, which provides protection from ground predators.
- 7The Atlantic Forest, their primary habitat, is one of the most endangered biomes in the world, with only about 15% of its original extent remaining.
Chestnut-backed Tanager Conservation Status
The IUCN currently lists the Chestnut-backed Tanager as Least Concern, but its population trend shows signs of decline due to ongoing habitat loss. Deforestation in the Atlantic Forest is the primary threat, driven by agriculture and urban expansion. Conservation efforts include habitat protection through the establishment of reserves and national parks, which help preserve the remaining fragments of the Atlantic Forest. There have been concerted efforts to restore parts of this biome, which may benefit the Chestnut-backed Tanager and other endemic species. Historically, the population of the Chestnut-backed Tanager has fluctuated with changes in forest cover, highlighting the critical need for sustainable land management practices to ensure their long-term survival.
Attracting Chestnut-backed Tanagers to Your Feeder
The Chestnut-backed Tanager is a regular visitor to backyard bird feeders across its range. At the Eye On The Fly feeding station, we observe Chestnut-backed Tanagers regularly and capture footage with our feeder cameras.
