Blue-fronted Lancebill
Doryfera johannae
The blue-fronted lancebill is 9.6 to 11 cm (3.8 to 4.3 in) long. Males weigh 3 to 5 g (0.11 to 0.18 oz) and females 3.3 to 6 g (0.12 to 0.21 oz). Both sexes have a long straight to slightly upcurved bill, and often hold it at an upward angle. Males of the nominate subspecies have a violet forehead ("front"), a bronze nape, and otherwise dark bronzy green upperparts. The tail is short and blue-black. The underparts are blue-black with a bluish green gloss on the throat and breast. The female differs from the male by having a greenish blue forehead and dull grayish bronzy green underparts. Voice: The blue-fronted lancebill's song has not been described and apparently has not been recorded. While foraging it makes "thin, dry, chittering notes...e.g. 'chuert'."
ID text from Wikipedia, CC BY-SA 4.0
Green-fronted Lancebill
Doryfera ludovicae
The green-fronted lancebill, as the name suggests, is distinguished by a "glittering" green patch of feathers on their forehead. Between males and females, males consistently have a prominent forehead patch, however, literature is inconsistent on the appearance of females. One notable source claims females can vary widely between individuals, stating the female forehead with regards to both feather development and color intensity, can range from barely visible to indistinguishable from common male plumage.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Blue-fronted Lancebill and Green-fronted Lancebill.