Ruddy-tailed Flycatcher
Terenotriccus erythrurus
The ruddy-tailed flycatcher is 9.0–10.3 cm (3.5–4.1 in) long and weighs 7 g (0.25 oz). The upperparts are grey-olive, with a rufous rump, tail, wings and eye ring. The throat is buff and the breast is cinnamon, becoming pale buff on the belly. Sexes are similar, but young birds are brighter above and have a browner tail and breast. It has a see-oo see call, and a repetitive eek eek eek eek eek song. It sometimes flicks both wings up to make a faint whirring sound.
ID text from Wikipedia, CC BY-SA 4.0

Tropical Royal Flycatcher
Onychorhynchus coronatus
The tropical royal flycatcher is approximately 12.5 to 18 cm (4.9 to 7.1 in) long and weighs 9.7 to 21 g (0.34 to 0.74 oz). It has an erectile fan-shaped crest. In the nominate subspecies O. c. coronatus it is red with blue tips in the male and yellow or orange in the female. The sexes' plumages are otherwise alike. Adults have a broken buffy eye ring and a faint buffy streak on the cheek. Their upperparts are dark brown with narrow black and buffy bars on the lower back. Their rump and tail are cinnamon-rufous that is browner towards the end of the tail. Voice: The tropical royal flycatcher is usually inconspicuous and quiet. Its songs differ among the subspecies. That of O. c. coronatus and O. c. castelnaui is "a series of long melodious whistles, starting with a loud flat-pitched introductory note and followed by a series of lower-pitched disyllabic mellow whistles wheeee-pihuuw-pihuuuw-pihuuw". That of O. c.
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: Ruddy-tailed Flycatcher and Tropical Royal Flycatcher.