Ruby-crowned Tanager

Is a medium-sized passerine bird characterized by a striking and extreme sexual dimorphism, making males and females look like completely different species. The adult male exhibits a sleek, glossy blue-black plumage covering almost its entire body, which contrasts sharply with its bright white underwing coverts that become highly visible during flight or wing-stretching displays. On its head, the male possesses a semi-concealed crown patch of vibrant ruby-red or scarlet feathers, which is usually kept flat but flared during courtship or territorial disputes. In contrast, the adult female lacks any black or red tones, displaying an overall warm rufous-brown or olive-brown upper plumage and a lighter, rich cinnamon-buff underbody. On average, this species measures about 18 centimeters in total length and weighs between 26 and 33 grams, featuring a robust, dark conical bill.

Geographical distribution: This bird is endemic to the southern regions of South America, with a distribution strictly tied to the complex ecosystems of the Atlantic Forest. Its range extends across southeastern Brazil, from the states of Bahia and Minas Gerais southward to Rio Grande do Sul. Additionally, its geographical range encompasses eastern Paraguay and the northeastern corner of Argentina, specifically within the rainforest remnants of the Misiones Province.

Habitat: It primarily frequents the understory, mid-story, and edges of humid subtropical and tropical forests, showing a remarkable adaptability to degraded environments. It is frequently observed in secondary forests, old-growth woodlots, shrubby clearings, shaded agricultural plantations, and even leafy suburban parks and residential gardens with dense vegetation. Its elevational distribution ranges from sea level up to approximately 1,200 meters above sea level.

Feeding: It maintains an omnivorous diet that shifts according to seasonal resource availability. It feeds heavily on a wide variety of wild berries, fleshy fruits, and seeds obtained from native trees and shrubs, acting as an important seed disperser. It complements its diet by actively foraging for insects, caterpillars, and spiders, which it gleans from leaf surfaces or twigs. It is also known to join army ant swarms to capture fleeing arthropods and frequently visits backyard bird feeders to consume bananas and papayas.

Behavior: It is a restless, agile, and highly social species that is seldom seen alone, usually moving in pairs, small family units, or joining mixed-species foraging flocks alongside other tanagers and insectivorous forest birds. Males are highly territorial and perform elaborate visual displays, flaring their bright red crests and flicking their wings to expose the stark white underwing linings. Its vocalizations consist of sharp, metallic call notes used to maintain contact with flock members as they move through dense vegetation.

Nesting: The breeding season typically spans from the austral spring to early summer, aligning with peak food availability. The female constructs a neat, cup-shaped nest placed low in dense vegetation, usually between 1 and 3 meters above the ground, using dry leaves, plant fibers, and fine rootlets bound together with spider silk. The clutch consists of 2 to 3 pale pinkish-white eggs heavily speckled with dark brown or purplish spots. While the female is solely responsible for incubating the eggs, both parents play an active role in defending the nesting territory and feeding the altricial nestlings.

Conservation status: It is currently categorized as Least Concern (LC) on the IUCN Red List of Threatened Species. Although its population is considered stable and it is relatively common within its range, ongoing habitat loss, fragmentation of the Atlantic Forest, and urbanization remain persistent long-term threats to local populations.