How to identify the Purple Sunbird

To correctly identify the Purple Sunbird (Cinnyris asiaticus), check each of these features. Birds can be tricky: habit, habitat, and call often confirm a sighting that a single photo cannot.

Size at a glance

Length

10-11 cm

Wingspan

13-15 cm

Weight

5-10 g

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   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.

2. 2

   Beak shape

   Shape and color of the bill: a key field mark.

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

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown

4. 4

   Leg color

   Leg and foot color.

   Dark grey to black

5. 5

   Distinguishing features

   Standout features that separate this species.

   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.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   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.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   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.

8. 8

   Sexual dimorphism

   How males and females differ.

   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.

Key field marks

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

Explore the Purple Sunbird