Description
Purple-rumped Sunbirds are tiny at less than 10 cm long. They have medium-length thin down-curved bills and brush-tipped tubular tongues, both adaptations to their nectar feeding. Purple-rumped Sunbirds are sexually dimorphic. The males have a dark maroon upperside with a blue-green crown that is visible in some angles. There are violet patches on the throat and rump which are visible only in good lighting. There is also a maroon breast band. In the Western Ghats, it can overlap in some areas with the Crimson-backed Sunbird but that species has reddish upperparts. The female has a white throat followed by yellowish breast. There is a bright green shoulder patch. The upperside is olive or brownish. The uppertail coverts are black and a weak supercilium is visible. The nominate form is found in Sri Lanka and has a more bluish violet throat whereas the Indian form flaviventris (two other proposed populations whistleri from Maddur in Karnataka and sola from Pondicherry are subsumed) has a more pinkish tinge.
Their call is ptsiee ptsit, ptsiee ptsswit or a sharp twittering tityou, titou, trrrtit, tityou....
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