After which developmental event does the Western Tanager acquire its distinct, bright adult male plumage?
Answer
After the first prebasic molt
The development of bright coloration in male Western Tanagers is tied to sexual maturity and is not present from birth. Juveniles are born with drab, olive-green plumage, similar to the appearance of adult females, which aids in initial survival and camouflage. The transition to the unmistakable, bright adult male coloration—featuring the yellow body and red head—occurs only after the bird undergoes its first prebasic molt. This molt takes place subsequent to the first breeding season. Consequently, first-year males often display an intermediate or female-like appearance, delaying their full competitive entry into the breeding pool until they possess the necessary signaling plumage.
Related Questions
To which family does DNA evidence definitively place the genus Piranga, including the Western Tanager?Which relative species within the Piranga genus is noted for being largely non-migratory, remaining in the southwestern US and Mexico year-round?What specific combination describes the male Western Tanager's striking fresh spring plumage?What geological feature or environmental boundary reinforces the Western Tanager's distinct western lineage, as it is generally absent as a consistent breeder east of this demarcation?After which developmental event does the Western Tanager acquire its distinct, bright adult male plumage?What were the primary morphological and behavioral characteristics used historically to group the Western Tanager with South American true tanagers?How is the female Western Tanager generally described in terms of coloration when contrasted with the male's vibrant display?To which lower-elevation regions does the entire population of Western Tanagers migrate to escape harsh northern winters?What primary evolutionary function is served by the female Western Tanager's less conspicuous, drab camouflage coloration?What specific type of forest habitat, often found at high elevations, does the Western Tanager utilize for breeding across the western mountains?