Crimson Rosella (Blue-cheeked Rosella, Mountain Lowry)

The Crimson Rosella is a medium-sized Australian parrot (32-36cm). While adults are famously crimson-red with blue cheeks and black-scalloped backs, juveniles are largely olive-green, and several variations (like the Adelaide Rosella) show patches of blue and orange. This feather represents the vibrant blue transition often seen in the wings, tail, or specific ventral patches.

Uniformly turquoise-blue or cerulean. The coloration is structural (Tyndall scattering) rather than pigment-based, common in parrot blues. Some minor darker gray tinting is visible at the very base of the barbs near the downy section.

The upper portion is pennaceous and tightly interlocked, while the proximal half is plumulaceous (downy) for thermal insulation. No specialized comb-edges.

Smooth, silky, and somewhat matte. The surface has a slightly waxy feel typical of psittacines which produce powder down for feather maintenance.

Distinctive electric blue structural color, small rounded contour shape, and the presence of a well-developed downy base for thermoregulation.

Eucalypt forests, woodlands, gardens, and urban parks. Frequently found in mountain forests and coastal scrub.

Southeastern and Eastern Australia, including coastal New South Wales, Victoria, and parts of Queensland and South Australia. Introduced to Norfolk and Lord Howe Islands.

Primary seed disperser and occasional pollinator. They play a vital role in forest regeneration but can also be considered pests in fruit orchards.

Eastern Rosella (Platycercus eximius) has similar blue wing feathers but more yellow/green; Australian Ringneck (Barnardius zonarius) has different green/blue gradients.

Crimson Rosellas exhibit 'clinal variation' where their colors change gradually across their geographic range, from yellow in the north to deep crimson in the south. They are also highly intelligent and can live over 20 years.

Fair to Good. The feather appears slightly weathered by UV exposure and grass-staining, suggesting it is a molted specimen rather than one from a recent predation event.