North-eastern Madagascar (from Marojejy region south to Tsaratanana and Mantadia).
 
Population
Estimated population is 10,000 - 19,999 (2010) and decreasing.
Status EN
Habitat destruction and degradation through clearance for shifting agriculture and commercial exploitation of timber, is the main threat.
For more information see BirdLife International Species Factsheet.
Helmet Vanga (Euryceros prevostii) [XC536975]
by Dries Van de Loock from Iaroka Forest, Moramanga District, Toamasina Province, Madagascar (call)
Helmet Vanga (Euryceros prevostii) [XC162741]
by Mike Nelson from Chez Arol, Masoala NP, Madagascar (song)
Subspecies
No subspecies.
Has in the past sometimes been placed in a separate, monotypic family, Eurycerotidae. Recent molecular-genetic analysis indicates that genus may be closest to Calicalicus, Vanga, Cyanolanius and Schetba.