Chaco Owl (Strix chacoensis) [XC341786]
by id from Parque Nacional Teniente Enciso, Boqueron, Paraguay (call)
Chaco Owl (Strix chacoensis) [XC114071]
by Dan Lane from Parque Nacional Teniente Enciso, Boqueron, Paraguay (song)
Subspecies
Strix rufipes (Sibley and Monroe 1990, 1993) has been split into Rufous-legged Owl (Strix rufipes) and Chaco Owl (Strix chacoensis) following SACC (2005).
Usually treated as a subspecies of Rufous-legged Owl (Strix rufipes).