Undulated Antpitta
Grallaria squamigera
Grallaria antpittas are a "wonderful group of plump and round antbirds whose feathers are often fluffed up...they have stout bills, very short tails, and very long bluish gray legs". The undulated antpitta is the largest member of its genus that occurs in the higher Andes; it is 20 to 24 cm (7.9 to 9.4 in) long and weighs 112 to 174 g (4.0 to 6.1 oz). The sexes have the same plumage. Adults of the nominate subspecies have a gray crown and nape and mostly ashy brown upperparts with a variable olivaceous wash. Most upperparts feathers have darker edges that give a scaly appearance. Voice: The undulated antpitta typically sings from dawn into the early morning and from a low perch. It sings at any time of the year but more frequently during the breeding season. Its song has been compared to the voice of some small owls, "a fast hollow quavering trill that slightly ascends in pitch and lasts 3-4 seconds, e.g. 'hohohohohohohohohohohoho', with last few notes more enunciated".
ID text from Wikipedia, CC BY-SA 4.0

White-bellied Antpitta
Grallaria hypoleuca
Grallaria antpittas are a "wonderful group of plump and round antbirds whose feathers are often fluffed up...they have stout bills very short tails". The white-bellied antpitta is 16 to 18 cm (6.3 to 7.1 in) long; three males weighed 62 to 69 g (2.2 to 2.4 oz). The sexes have the same plumage. Adults of the nominate subspecies G. h. hypoleuca have a rufescent brown or dusky brown crown with some black streaks on the forecrown. They have white or gray lores on a rufous face. Their back, rump, wings, and tail are reddish brown. Their throat is white. Voice: The white-bellied antpitta's "simple and far-carrying song a fast too, téw-téw, given at rather long intervals (often 10 or more seconds)". Its call is "a strikingly pygmy-owl -like vocalization, too, too, too, too ...". The species typically sings from a perch within about 2 m (7 ft) of the ground.
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: Undulated Antpitta and White-bellied Antpitta.