Anna's Hummingbird vs Black-backed Thornbill
Calypte anna เปรียบเทียบกับ Ramphomicron dorsale
Side-by-Side Comparison
| คุณสมบัติ | Anna's Hummingbird | Black-backed Thornbill |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Calypte anna | Ramphomicron dorsale |
| อันดับ | Caprimulgiformes | Caprimulgiformes |
| วงศ์ตระกูล | Trochilidae | Trochilidae |
| สถานะการอนุรักษ์ | Least Concern | Near Threatened |
| ความยาว | 10.0 cm (3.9 in) | — |
| กว้างปีก | 12.0 cm (4.7 in) | 11.0 cm (4.3 in) |
| น้ำหนัก | 4.3 g (0.15 oz) | 3.5 g (0.12 oz) |
| อาหาร | Nectar, small insects, and tree sap. Visits a wide variety of native and ornamental flowering … | Nectarivore of high montane scrub and páramo; short bill suits small compact flowers. Gleans tiny … |
| จำนวนไข่ | 2 | -- |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
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Anna's Hummingbird only
Black-backed Thornbill only
Anna's Hummingbird
Chaparral, coastal sage scrub, gardens, parks, and open woodland along the Pacific coast. One of few hummingbirds not fully migratory.
Song & Call Comparison
Anna's Hummingbird
Male produces a complex, scratchy song with buzzy 'dzzzzt' notes. Gives a nasal 'chee-chee-chee'. Males sing year-round, even in winter; one of few hummingbirds with true song.
Black-backed Thornbill
Soft, sibilant hissing trill; gentle continuous buzz with slight pulsing quality during slow hover near blossoms.
Geographic Range & Migration
Anna's Hummingbird
Western North America from southern British Columbia along the Pacific coast to Baja California. Range has expanded northward.
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.
สถานะการอนุรักษ์
Anna's Hummingbird
Black-backed Thornbill
How to Tell Them Apart
Anna's Hummingbird
Metallic bronze-green upperparts. Males have an iridescent rose-red crown and gorget. Females have green upperparts with grey underparts and a small red gorget patch.
Medium-length, straight, thin black bill
Black-backed Thornbill
Coppery Emerald (alt): males with glittering purple-magenta gorget; metallic green above; white pectoral tufts; females spotted below
About These Birds
Anna's Hummingbird
Anna's hummingbird is the most common hummingbird along the Pacific coast and one of only three species resident in the United States year-round. Males perform spectacular dive displays, plummeting from 40 meters and pulling up with a loud chirp produced by tail feathers. Their body temperature can drop to near ambient at night to conserve energy.
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.