|I have not been paying enough attention to two Brown-throated Sunbirds in the garden who have been enjoying the nectar from our Callistemon spp (Bottlebrush tree) and Albizia spp (Mimosa Tree).
Some images of the self-feeding male, moulting. This could be a juvenile/immature moulting into adult plumage, but there hardly any â€˜convincingâ€™ gape present and bare parts look adult. There is no data on eclipse plumage phase for adults but it may be possible. I am uncertain why the tail in this bird is so short. The calls the bird made were like those of an adult. Note that juvenile bills are usually lighter with some pale pink/orange.
This is a sonogram of the calls of this male. These are the common calls made by this species and usually repeated in varying frequency â€“ can be rapid in sequence (every second) or 3-5 seconds apart. HBW 2020 describes these 2-3 note calls as the song and translates them as sweet-sweet, or swit-swit-sweet. The sonogram is fascinating in its structure, showing far more complexity to the song than what we hear with our ears.
A call recording can be found here: https://www.xeno-canto.org/579168