Whistling Heron (Syrigma sibilatrix) [XC463466]
by Daniel Mello from Parque Nacional El Pamar, Col\u00f3n, Entre R\u00edos, Argentina (call)
Whistling Heron (Syrigma sibilatrix) [XC777737]
by JAYRSON ARAUJO DE OLIVEIRA from Reserva do Setor S\u00edtio de Recreio Cara\u00edbas-Goi\u00e2nia, Goi\u00e1s, Brazil (call, song)
Subspecies
Validity of subspecies fostersmithi sometimes questioned.
The following 2 subspecies are recognised:
sibilatrix (Temminck, 1824) - Bolivia to south-eastern Brazil and north-eastern Argentina.