Rufous-booted Racket-tail vs Black-billed Streamertail
Ocreatus addae so với Trochilus scitulus
Side-by-Side Comparison
| Thuộc Tính | Rufous-booted Racket-tail | Black-billed Streamertail |
|---|---|---|
| Tên Khoa Học | Ocreatus addae | Trochilus scitulus |
| Bộ | Caprimulgiformes | Caprimulgiformes |
| Họ | Trochilidae | Trochilidae |
| Tình Trạng Bảo Tồn | Not Evaluated | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | — | 13,0 cm (5.1 in) |
| Khối Lượng | 3,0 g (0.11 oz) | 4,7 g (0.17 oz) |
| Chế Độ Ăn | Nectarivore of Bolivian and Peruvian cloud forest; visits Ericaceae and bromeliads. Gleans small insects from … | Nectarivore probing tubular flowers in humid forest. Supplements nectar diet with small insects and spiders … |
| Số Trứng | 2 | 2 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Rufous-booted Racket-tail only
Không
Black-billed Streamertail only
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Song & Call Comparison
Rufous-booted Racket-tail
Deep, resonant hum barely audible; extremely low vibration barely perceptible during hovering near high-altitude flowers.
Black-billed Streamertail
Buzzy, insect-like sustained trill; continuous high-frequency vibration with rapid modulation near nectar flowers.
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-billed Streamertail
Endemic to the eastern Blue Mountains of Jamaica. Restricted to montane forest. Sometimes treated as subspecies.
Tình Trạng Bảo Tồn
Rufous-booted Racket-tail
Black-billed Streamertail
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-billed Streamertail
Black-faced Coucal: glossy black head; rufous-brown wings; black underparts; red eye; long dark tail; sexually similar plumage
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-billed Streamertail
A hummingbird (9-10 cm body + long tail streamers in males) endemic to the eastern Blue Mountains of Jamaica. Males similar to Red-billed Streamertail but with a black bill. Nectarivore of montane forest. Sometimes considered a subspecies of Red-billed Streamertail.