White Monjita
Xolmis irupero
The white monjita is 17 to 18 cm (6.7 to 7.1 in) long and weighs 21 to 29.5 g (0.74 to 1.0 oz). Adult males of the nominate subspecies are almost entirely white. They have black primaries, primary coverts, and tail tip. Females are almost identical but have a gray tinge on their back. Subspecies X. i. niveus is slightly smaller than the nominate and has a wider black band on the tail. Both sexes of both subspecies have a dark brown iris, a black bill, and black legs and feet. Voice: The white monjita is not highly vocal. The male's dawn song is a "soft, repeated preeeyp tooit preeeyp tooit". The species also gives "weak ghiks" and "a whining piew".
ID text from Wikipedia, CC BY-SA 4.0
White-rumped Monjita
Xolmis velatus
The white-rumped monjita is 19 to 20 cm (7.5 to 7.9 in) long. The sexes have the same plumage. Adults have a mostly white head with a pearly gray nape. Their upperparts are mostly brownish gray with a white rump. The basal half of their tail is white and the rest black. Their wings are blackish with a white band at the base of the flight feathers that shows as a stripe in flight. Their inner secondaries and tertials also have a white patch. Their underparts are entirely white. They have a dark iris, a black bill, and dusky blackish legs and feet. Voice: The white-rumped monjita is not highly vocal. Its song is a "nasal, downslurred njeh, repeated at 1-sec intervals". It sometimes gives a single whistle at night.
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: White Monjita and White-rumped Monjita.