“Here are clips of uncommonly heard sub-songs of 2 common species – Asian Glossy Starling (Aplonis panayensis) and Olive-winged Bulbul (Pycnonotus plumosus).
“Asian Glossy Starlings frequently descend into the trees opposite my house in large noisy flocks, but it is an uncommon sight to see one in my garden, and even more special to see it singing a soft sub-song this evening…
“Also saw this Olive-winged Bulbul singing in the evening, for a few minutes, by the water’s edge at Macritchie Reservoir :
“Sub·song – ‘an unstructured, often rambling vocalization of low volume heard in young birds and, at the start of the breeding season, in adult birds of certain species.’ – LINK.
29th April 2012