Blacksmith Thrush

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Quick Facts

  • Scientific Name: Turdus subalaris
  • Spanish Name: Mirlo herrero
  • Family: Turdidae
  • Known Nicknames: Blacksmith Thrush, Eastern Slaty Thrush
  • Average Length: 22–24 cm / 8.7–9.4 in
  • Average Weight: 60–80 g / 2.1–2.8 oz
  • Wingspan: 34–38 cm / 13.4–15.0 in
  • Key Feature: Slate-gray upperparts and blackish tail with white outer rectrices
  • Primary Diet: Primarily Frugivore and Insectivore
  • Range: Eastern Paraguay, southeastern Brazil, northeastern Argentina, and Uruguay
  • Habitat: Atlantic Forest, humid woodlands, and forest edges
  • Social Structure: Solitary or in pairs
  • Nesting/Breeding: Cup nest in tree fork or shrub
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Blacksmith Thrush (*Turdus subalaris*) is a striking, medium-sized songbird native to the subtropical and temperate forests of southeastern South America, particularly Argentina, Paraguay, and Brazil. Its common name derives from the male’s distinctive, metallic *tsee-tsee-tsee* call, which rings through the undergrowth like a hammer on an anvil. The general appearance is sleek and elegant: adults display a rich, dark olive-brown back and wings, contrasting sharply with a pale, almost whitish throat and belly, while the breast is boldly marked with dense, dark spots that resemble a chainmail pattern. A unique special feature is the bird’s bright, fiery orange eye-ring and equally vivid orange-yellow bill base, which gives its face a perpetually alert and expressive look. Unlike many thrushes, the Blacksmith Thrush is notably shy and terrestrial, preferring to forage quietly on the forest floor for insects and fallen fruits, and its haunting, fluting song at dawn and dusk adds a wild, melancholic beauty to its woodland home.

Fun Facts

Despite its name, the Blacksmith Thrush isn't actually black—its moniker comes from its loud, metallic call that sounds like a hammer striking an anvil, a perfect mimicry of a blacksmith at work. A quirky escape artist, it often feigns a broken wing to lure predators away from its nest, dragging itself along the ground before suddenly flying off. It also has a bizarre adaptation for feeding: it will repeatedly bash snails against a favorite "anvil" stone with such force that the shell shatters, allowing it to access the soft body inside with surgical precision.

Habitats & Distribution

The Blacksmith Thrush primarily inhabits humid montane forests and cloud forests on the eastern slopes of the Andes, typically at elevations between 1,000 and 2,500 meters. It is found in dense undergrowth, forest edges, and bamboo thickets, often near streams or ravines. Its geographical range is restricted to a narrow strip extending from southern Ecuador through Peru to northwestern Bolivia, with isolated populations possibly occurring in adjacent lowland foothills during the non-breeding season. It avoids open, deforested areas and is most common in undisturbed or lightly fragmented primary forest.

Behaviours & Reproduction

The Blacksmith Thrush is generally solitary or found in pairs during the breeding season, with a loose social structure outside of nesting periods. Mating is monogamous for the season, initiated by the male’s complex, flute-like song delivered from a high perch to defend a territory and attract a female. The pair builds a cup-shaped nest of mud and plant fibers in a tree fork or dense shrub, where the female typically lays two to three pale blue eggs with reddish speckles. Both parents share incubation duties for about 12 to 14 days, and after hatching, they cooperatively feed the chicks on insects and berries. A unique reproductive strategy involves the use of mud in nest construction, which hardens to provide structural stability and camouflage against predators. The young fledge after roughly two weeks but remain dependent on the parents for several more weeks before dispersing.

Diet

The Blacksmith Thrush is primarily an omnivorous forager, with its diet consisting largely of invertebrates such as insects, spiders, earthworms, and snails, which it hunts by flipping leaf litter on the forest floor. During the fruiting season, it shifts significantly to consuming a wide variety of berries and soft fruits, often swallowing them whole and dispersing seeds. An interesting dietary habit is that this thrush is known to crush snail shells against hard stones or roots to access the soft body, a behavior that sometimes leaves small piles of shell fragments near favored "anvil" sites. Additionally, it has been observed occasionally feeding on fallen tree sap and small amphibians, demonstrating a flexible feeding strategy that adapts to seasonal availability.

Colors

The Blacksmith Thrush is predominantly dark slate-gray above with a paler, whitish-gray throat and breast, transitioning to a warm orange-buff belly and vent. Its most distinctive feature is the bold, blackish malar stripe (like a "blacksmith's beard") contrasting with the pale throat, and it shows no strong barring or spots, relying on its uniform, shadowy coloration for camouflage in the understory.

Distribution Map

Places linked to this species. A sighting is never guaranteed.