The Nuoc family includes medium-sized red-bellied swallows, measuring around 35 cm. Male and female birds have slight differences in their appearance. The fully grown male has a deep red head and upper breast, while the female’s is brown. Both genders have light red lower breasts, dark brown backs, and white undertail feathers tipped with black.
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The red-headed trogon is one of the medium-sized species in the trogon family, measuring around 35 cm. There’s not much difference between the males and females of this species. The male red-headed trogon has an olive-brown upper breast and a deep red head while both male and female have reddish-brown backs, pale red lower breasts, and white undertails with black outlines.