A long-tailed bird of montane forest canopy. Male has much longer tail with an iridescent green head and bib with a black chest band bordered with a thin gold stripe. Female is blackish with barring on the belly. Feeds on fruit and searches for insects on mossy branches and epiphytes. Similar to Ribbon-tailed Astrapia (with which it can hybridize), but female Stephanie’s lacks the iridescence on the head and the male’s tail is black rather than white. Voice, a rising, nasal “week!”.