Third-declension noun.

What's pavo?

: a southern constellation that is visible between the constellations of Telescopium and Octans and that is represented by the figure of a peacock The region covers a third of the night sky in the Southern Hemisphere, from the constellation Centaurus on one side to Pavo and Indus on the other.—

Where does the word pavo come from?

The Spanish, however, called the native bird “pavo,” from the Latin “pavus,” originally meaning “peacock.” After the Conquest, the word shifted to signify “turkey,” and the peacock became the “pavo real” or “royal” turkey, heh.