I saw this young (immature) self-feeding Flowerpecker at the forest edge in Ipoh on 22nd July 2021. It had a white malar stripe developing with some yellow in the breast. There was a thick orange bill tipped with black. There was no orange or scarlet patch on the crown (had more images to see this well).
This is a juvenile/immature Crimson-breasted Flowerpecker (Prionochilus percussus ignicapilla) (above, below). At present it is hard to say a male or female.
Having seen many juveniles over the years I thought I would extract a few images and show the progression from a young juvenile to adulthood.
In the composite image above: Birds 1 and 2 are a younger and older juvenile. One of the first signs of change is the bill tip becoming black (No 2) with some yellow in the breast and an early malar flash. By this time they are self-feeding. Bird 3 is an immature female – it had an orange crown patch, a darker bill and more yellow in the breast. Bird 4 is an immature male – it had a darker bill, deeper yellow in the breast and blue appearing above. Bird 5 is an adult female and bird 6 is an adult male.
Amar-Singh HSS (Dato’ Dr)
Ipoh, Perak, Malaysia