found: Work cat.: Johnson, G. Vocalizations in the grey butcherbird Cracticus torquatus with emphasis on structure in male breeding song, 2003:pp. 27-28 (butcherbirds; genus Cracticus, family Artamidae; there are seven species of Cracticus, four in Australia and four in New Guinea)
found: ITIS, Apr. 21, 2006(genus Cracticus, family Corvidae)
found: Avibase : the world bird database, via WWW, Apr. 21, 2006(Silver-backed Butcherbird (Cracticus argenteus); Hooded Butcherbird (Cracticus cassicus); Tagula Butcherbird (Cracticus louisiadensis); Black-backed Butcherbird (Cracticus mentalis); Pied Butcherbird (Cracticus nigrogularis); Black Butcherbird (Cracticus quoyi); Grey Butcherbird (Cracticus torquatus); family Cracticidae; variant common names listed for some species have form "Butcher Bird" instead of "Butcherbird")
found: Complete list of bird species included in the Handbook of Australian, New Zealand, and Antarctic birds, with amendments, last update 13 June 2003, viewed via WWW, Apr. 21, 2006(Cracticus quoyi, Black Butcherbird; Cracticus torquatus, Grey Butcherbird; Cracticus mentalis, Black-backed Butcherbird; Cracticus nigrogularis, Pied Butcherbird; family Artamidae)
found: Draft working list of birds of Australia and Australian Territories, 2003, via WWW, Apr. 21, 2006(Black Butcherbird, Cracticus quoyi; Grey Butcherbird, Cracticus torquatus; Black-backed Butcherbird, Cracticus mentalis; Pied Butcherbird, Cracticus nigrogularis; Artamidae)
