The Western or Arfak Parotia, Parotia sefilata, is a medium-sized, approximately 33 cm long, bird of paradise with a medium-length tail.
Like other birds of paradise, the Western Parotia is sexually dimorphic. The male has black plumage with an iridescent structurally coloured golden-green breast shield and triangular silver feathers on its crown. It is adorned with elongated black plumes at the sides of the breast and three erectile spatulate head wires behind each eye. As with most member in the family, the female is unadorned and has brown plumage. The species is similar to Lawes's Parotia (Parotia lawesii).
In courtship display, the male performs a ballerina-like dance with its elongated black plumes spread around skirt-like, right below the iridescence breast shield. During the spectacular dance, he shakes his head and neck rapidly to show the brilliance of his inverted silver triangle-shaped head adornment to attending females.
The diet consists mainly of fruits such as figs, and arthropods.