Collared Kingfisher
Todiramphus chloris
The collared kingfisher is 23 to 25 cm (9.1 to 9.8 in) long and the male weighs 51 to 90 g (1.8 to 3.2 oz), while the female weighs 54–100 g (1.9–3.5 oz). It varies from blue to green above while the underparts can be white or buff. There is a white collar around the neck, giving the bird its name. Some races have a white or buff stripe over the eye while others have a white spot between the eye and bill. There may be a black stripe through the eye. The large bill is black with a pale yellow base to the lower mandible. Females tend to be greener than the males.
ID text from Wikipedia, CC BY-SA 4.0
Sacred Kingfisher
Todiramphus sanctus
The sacred kingfisher is mostly blue-green to turquoise above with white underparts and collar feathers, a black mask and buff lores. Both sexes are similar, but females are usually greener, duller and less buff beneath, and juveniles have buff or mottled brown edges on the collar, underparts and upper-wing coverts. Adults are 20–23 cm (7.9–9.1 in) long. Males weigh 28–61 g (1.0–2.2 oz) and females 28–56 g (1.0–2.0 oz).
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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