Anna's Hummingbird vs Green-headed Hillstar
Calypte anna compared with Oreotrochilus stolzmanni
Side-by-Side Comparison
| Attribute | Anna's Hummingbird | Green-headed Hillstar |
|---|---|---|
| Scientific Name | Calypte anna | Oreotrochilus stolzmanni |
| Order | Caprimulgiformes | Caprimulgiformes |
| Family | Trochilidae | Trochilidae |
| Conservation Status | Least Concern | Least Concern |
| Length | 10.0 cm (3.9 in) | — |
| Wingspan | 12.0 cm (4.7 in) | 14.5 cm (5.7 in) |
| Weight | 4.3 g (0.15 oz) | 8.016666666666667 g (0.28 oz) |
| Diet | Nectar, small insects, and tree sap. Visits a wide variety of native and ornamental flowering … | Nectarivore of Peruvian high puna; visits Chuquiraga and Lupinus blooms. Supplements with small flies and … |
| Clutch Size | 2 | 2 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Shared Habitats
None
Anna's Hummingbird only
Green-headed Hillstar 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.
Green-headed Hillstar
Soft, pure descending whistle; gentle single note curving downward smoothly, warm and musical in quiet forest.
Geographic Range & Migration
Anna's Hummingbird
Western North America from southern British Columbia along the Pacific coast to Baja California. Range has expanded northward.
Green-headed Hillstar
Found on the western Andean slope and coastal desert hills of Peru at 1,500–3,600 m elevation.
Conservation Status
Anna's Hummingbird
Green-headed Hillstar
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
Green-headed Hillstar
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.
Green-headed Hillstar
A medium-sized hummingbird (11-12 cm) found in the Andes of Peru and Ecuador at 2,800-4,200 m. Green plumage with a glittering green hood. Nectarivore of high-altitude shrubs and Puya plants. Closely related to Andean Hillstar. Sometimes considered conspecific.