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Crossbills are birds of the genus Loxia within the finch family (Fringillidae), with six species.
The genus name is from the Ancient Greek loxos, "crosswise".

1/ Red crossbill or common crossbill (Mỏ chéo, Loxia curvirostra)
curvirostra is Latin for "curved bill".

Red crossbill or common crossbill 
(Mỏ chéo, Loxia curvirostra)

Fringillidae, Fringilla: in Latin, a small bird, possibly the robin or the chaffinch, finch
Loxia: From Ancient Greek λοξός (loxós, “slanting, crosswise”).
curvirostra is Latin for "curved bill".
curvus meaning "curved" 
-rostris meaning "billed".

The red crossbill or common crossbill is a small passerine bird in the finch family Fringillidae.