Pale-breasted Thrush
Turdus leucomelas
The pale-breasted thrush is 23 to 27 cm (9.1 to 11 in) long and weighs 47 to 78 g (1.7 to 2.8 oz). The sexes have essentially the same plumage, though females sometimes have darker heads than males. Adults of the nominate subspecies T. l. leucomelas have a medium gray crown and whitish-streaked grayish ear coverts. Their upperparts, wings, and tail are generally pale olive brown. Their wing coverts and the edges of their secondaries are slightly rustier and their primaries and tail are somewhat darker. Voice: The pale-breasted thrush sings in a tree from its mid-section to crown and sometimes in flight. Its song is "a series of melodious phrases with individual notes variably repeated, chirr juep juele chip chirr". It has been compared to that of an American robin (T. migratorius) but is more complex.
ID text from Wikipedia, CC BY-SA 4.0
Rufous-bellied Thrush
Turdus rufiventris
This species is named after its distinctive reddish-orange underparts. Rufous-bellied thrushes can reach a length of 25 cm and weigh up to 68 g (male) or 78 g (female), though weights of about 59 g for males and 64 g for females are more usual. Contrary to what one might expect from the rather marked weight difference, the females are not larger, only plumper; their tarsus is actually a bit shorter than that of males on average.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play BeakBrainPhotos and recordings are credited to their authors under the licence shown. Full profiles: Pale-breasted Thrush and Rufous-bellied Thrush.