The adult male Collared Sunbird (1st & 2nd photo) has glossy green upperparts, head and throat with a yellow belly and narrow purple breast band.
The female (3rd, 4th & 5th photo) is a duller green above, has a yellow throat and an entirely yellow belly.
The Collared Sunbird is around 9-10 cm in length and has a shorter bill compared to other sunbirds.

Bugoma Forest Reserve, Uganda, 9 September 2025