Reddish Hermit
Phaethornis ruber
The reddish hermit is 8 to 9 cm (3.1 to 3.5 in) long and weighs 1.8 to 3 g (0.06 to 0.11 oz). All subspecies are generally dark green and rufous on the upperparts and cinnamon rufous on the underparts. Males have a black band on the chest and the tail feather have narrow white or reddish tips. Females have lighter underparts than the males. P. r. episcopus is about the same size as the nominate but has orange-rufous rather than cinnamon-rufous underparts and white tips to the tail. P. r. nigricinctus is the smallest subspecies; it has the richest rufous underparts. P. r. Voice: The reddish hermit's song is "a high-pitched phrase repeated incessantly with clear pauses between phrases...evenly-spaced, slightly descending, single notes followed by a number of accelerating descending notes, e.g. 'tsee....tsee...tsee...tsee.tse.tsitsi'." It frequently sings for long periods at leks. It has "long whining calls" made while hovering and a "stip!" flight call.
ID text from Wikipedia, CC BY-SA 4.0

Scale-throated Hermit
Phaethornis eurynome
The scale-throated hermit is about 14 to 14.5 cm (5.5 to 5.7 in) long. Males weigh 4.5 to 6 g (0.16 to 0.21 oz) and females 4 to 5 g (0.14 to 0.18 oz). This medium-sized hermit is olive green above with grayish underparts. Its dark throat whose feathers have lighter edges give the eponymous scaly appearance. The face has a black "mask" with a pale supercilium and gular stripe. Its tail feathers have white tips and the middle pair are longer than the others. The sexes are similar but the female has shorter wings and a less strongly decurved bill. The two subspecies have identical plumage but P. Voice: The scale-throated hermit's song is variable, "but typically comprises 2–4 notes, e.g. 'tsi-tseee....tsi-tseee..' or 'tsi-tsu-tseeé...tsi-tsu-tseeé...' etc." Its calls include "a plaintive 'tsew' and a more upslurred 'tsee'."
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: Reddish Hermit and Scale-throated Hermit.