Rufous-booted Racket-tail vs Black-backed Thornbill
Ocreatus addae 비교 대상 Ramphomicron dorsale
Side-by-Side Comparison
| 속성 | Rufous-booted Racket-tail | Black-backed Thornbill |
|---|---|---|
| 학명 | Ocreatus addae | Ramphomicron dorsale |
| 목 | Caprimulgiformes | Caprimulgiformes |
| 과 | Trochilidae | Trochilidae |
| 보전 상태 | Not Evaluated | Near Threatened |
| 체장 | — | — |
| 날개 폭 | — | 11.0 cm (4.3 in) |
| 체중 | 3.0 g (0.11 oz) | 3.5 g (0.12 oz) |
| 식성 | Nectarivore of Bolivian and Peruvian cloud forest; visits Ericaceae and bromeliads. Gleans small insects from … | Nectarivore of high montane scrub and páramo; short bill suits small compact flowers. Gleans tiny … |
| 산란 수 | 2 | -- |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Rufous-booted Racket-tail
Deep, resonant hum barely audible; extremely low vibration barely perceptible during hovering near high-altitude flowers.
Black-backed Thornbill
Soft, sibilant hissing trill; gentle continuous buzz with slight pulsing quality during slow hover near blossoms.
Geographic Range & Migration
Rufous-booted Racket-tail
Found in cloud forests of northern Bolivia and adjacent Peru and Brazil at 400–1,400 m elevation.
Black-backed Thornbill
Endemic to the Sierra Nevada de Santa Marta, Colombia, in high-elevation scrub and páramo. 1,800–3,500 m. Found nowhere else.
보전 상태
Rufous-booted Racket-tail
Black-backed Thornbill
How to Tell Them Apart
Rufous-booted Racket-tail
Golden-bellied Starfrontlet: tiny; males with brilliant orange-gold belly; violet gorget; females green above; spotted buff below
Black-backed Thornbill
Coppery Emerald (alt): males with glittering purple-magenta gorget; metallic green above; white pectoral tufts; females spotted below
About These Birds
Rufous-booted Racket-tail
A small hummingbird (8-10 cm plus tail rackets) found in Andean cloud forests of southeastern Peru and Bolivia at 1,200-2,200 m. Males have rufous leg puffs instead of white. Recently split from Booted Racket-tail. Nectarivore of montane forest undergrowth.
Black-backed Thornbill
A tiny hummingbird (7-8 cm) endemic to the Santa Marta Mountains of northern Colombia at 3,000-4,600 m. Dark back, tiny bill, and white underparts. Nectarivore of high-altitude páramo. Classified as Vulnerable due to restricted mountain-top habitat.