Purple Sunbird

About

The Purple Sunbird is a small passerine bird that is a resident breeder in tropical southern Asia from the Arabian Peninsula east to Southeast Asia. Like other sunbirds, they feed mainly on nectar, although they will also take insects, especially when feeding young. They have a fast and direct flight and can hover like hummingbirds to extract nectar from flowers. Males are iridescent purple-black during the breeding season, while females are duller.

Size & lifespan

Length

10-11 cm

Wingspan

13-15 cm

Weight

5-10 g

Lifespan

2-5 years in the wild

Diet

Nectarivore (primarily nectar, also insects and spiders)

Physical characteristics

Plumage

Breeding male: Entirely glossy metallic purple-black, appearing iridescent blue, green, or violet depending on the light. Non-breeding male (eclipse plumage): Similar to female, but retains a dark central stripe on the underparts and often some iridescent feathers. Female: Olive-brown upperparts, yellowish-white underparts, with a faint supercilium. Juvenile: Similar to female, but often duller and with a more mottled appearance.

Beak shape

Long, slender, decurved (downward-curved) black bill, adapted for probing flowers.

Eye color

Dark brown

Leg color

Dark grey to black

Distinguishing features

The long, decurved bill and the iridescent plumage of the breeding male are key features. The female's yellowish underparts and olive-brown upperparts are distinctive. The rapid, darting flight is also characteristic.

Juvenile appearance

Juveniles resemble females but are generally duller, with less distinct markings and often a yellowish wash on the underparts. Young males gradually acquire iridescent feathers.

Seasonal changes

Males exhibit significant seasonal plumage changes. During the breeding season (typically March-July), they are in full iridescent purple-black plumage. Outside the breeding season, they enter an eclipse plumage, resembling females but retaining a dark central stripe on the underparts and often some iridescent patches on the throat or breast.

Sexual dimorphism

Pronounced sexual dimorphism, especially during the breeding season. Males are iridescent purple-black, while females are dull olive-brown and yellowish-white. Males also undergo an eclipse plumage.

How to identify

1. 1

   Male Breeding Plumage

   Look for the entirely glossy metallic purple-black body. The iridescence can shift from blue to green to violet depending on the light angle. This is unmistakable.

2. 2

   Male Eclipse Plumage

   Observe for a duller, female-like appearance but with a distinct dark central stripe running down the underparts from the chin to the belly. Often, some iridescent patches remain on the throat or breast.

3. 3

   Female Plumage

   Identify by olive-brown upperparts and yellowish-white underparts. There is usually a faint pale supercilium (eyebrow stripe). The lack of any strong patterns or bright colors on the underparts helps distinguish it from other female sunbirds.

4. 4

   Bill Shape

   All Purple Sunbirds (male, female, juvenile) possess a long, thin, and distinctly decurved black bill, perfect for nectar feeding.

5. 5

   Behavior and Flight

   Watch for their rapid, darting flight and their ability to hover briefly in front of flowers. They are often seen actively probing flowers for nectar.

6. 6

   Vocalizations

   Listen for the male's high-pitched, rapid, jumbled song, often ending in a trill. The sharp 'chick' call is also a good indicator.

Habitat & range

Biomes

Tropical and subtropical dry forests, moist lowland forests, mangroves, savannas, shrublands, gardens, and urban areas.

Geographic range

Indian subcontinent, extending from the Arabian Peninsula (eastern Saudi Arabia, UAE, Oman) through Iran, Pakistan, India, Nepal, Bangladesh, Sri Lanka, and parts of Southeast Asia (Myanmar, Thailand).

Elevation range

Sea level up to approximately 2,000 meters (6,500 feet), though more common in lowlands.

Preferred environments

Highly adaptable, found in a variety of habitats including open woodlands, scrub, orchards, plantations, and especially urban and suburban gardens with flowering plants. They thrive in areas with abundant nectar sources.

Behavior

Activity time

Diurnal, most active during daylight hours.

Feeding habits

Primarily feeds on nectar, using its long, brush-tipped tongue to extract it from flowers. They often hover in front of flowers but also perch. They also consume small insects and spiders, particularly when feeding young, which provides essential protein. They may also 'rob' nectar by piercing the base of flowers.

Social behavior

Typically seen singly or in pairs. They can be quite territorial, especially during the breeding season, defending rich nectar sources. May join mixed-species feeding flocks outside the breeding season.

Flight pattern

Fast, direct, and often darting flight. Capable of hovering in front of flowers like hummingbirds, though not as sustained.

Migration pattern

Mostly resident throughout its range, but some local movements may occur in response to flowering seasons or food availability. Not a long-distance migrant.

Territoriality

Males are territorial, especially around nesting sites and prime feeding areas, often chasing away other sunbirds or small birds.

Breeding & reproduction

Breeding season

Varies geographically, but generally from February to July, coinciding with the availability of flowering plants. Can breed multiple times in a year.

Nesting habits

The female builds a small, purse-shaped or pendulous nest, typically suspended from a thin branch or twig, often in a thorny bush or tree. The nest is made of fine grass, cobwebs, lichens, and plant down, often decorated with insect cocoons or bark fragments. The entrance is usually on the side.

Clutch size

2-3 eggs

Egg description

Typically 2-3 eggs, oval-shaped, whitish or pale greenish-grey, often speckled or blotched with brown or purplish-grey, particularly at the broader end.

Incubation period

13-15 days, primarily by the female.

Fledging period

17-18 days after hatching. Both parents feed the young.

Parental care

Both parents participate in feeding the chicks, though the female does most of the incubation and initial brooding. Males are very active in defending the nest and feeding the fledglings.

Where to find

Field tips

1. Look for flowering plants. Purple Sunbirds are highly attracted to nectar sources. Focus your search on areas with abundant blooming flowers, especially those with tubular shapes.
2. Listen for their calls. Their distinctive song and calls can often lead you to their location before you see them. They are quite vocal, especially during the breeding season.
3. Observe their feeding behavior. Watch for small birds hovering or perching on flowers, probing with a long bill. Their rapid movements can be a giveaway.
4. Check for eclipse males. Outside the breeding season, remember that males will look similar to females but will have a dark central stripe on their underparts, which can be a key identification mark.

Similar species

Quick facts

Primary Diet:

Nectar

Male Breeding Plumage:

Iridescent purple-black

Female Plumage:

Olive-brown above, yellowish-white below

Nest Type:

Pendulous, purse-shaped

Flight Style:

Fast, darting, capable of hovering

Fun facts

• The iridescent plumage of the male Purple Sunbird is structural coloration, meaning the color is produced by the microscopic structure of the feathers, not by pigments. This causes the color to change with the angle of light.
• Despite their small size, Purple Sunbirds are quite aggressive and territorial, especially males defending their feeding territories or nesting sites.
• They are important pollinators for many plant species due to their nectar-feeding habits.
• The female builds the entire nest, which is often camouflaged with bits of bark, lichen, or even insect cocoons, making it difficult to spot.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Passeriformes

Family

Nectariniidae

Genus

Cinnyris

Species

Cinnyris asiaticus

Explore the Purple Sunbird