Claudio Contreras / Dumeril's boa (Acrantophis dumerili), captive.

Mark Carwardine / Madagascar boa {Acrantophis madagascariensis} coiled around branch at night, Aye-aye Island, north-east Madagascar

Chris Mattison / Dumeril's boa (Acrantophis dumerili), captive, occurs Madagascar

Chris Mattison / Dumeril's boa (Acrantophis dumerili), captive, occurs Madagascar

Daniel Heuclin / Dumeril's Ground Boa (Acrantophis dumerili) against white background. Endemic to Madagascar.

Loic Poidevin / Madagascar ground boa (Acrantophis madagascariensis) head portrait, Madagascar.

Edwin Giesbers / Madagascar ground boa (Acrantophis madagascariensis) Berenty Reserve, Madagascar

Edwin Giesbers / Madagascar ground boa (Acrantophis madagascariensis) portrait, Berenty Reserve, Madagascar

Edwin Giesbers / Madagascar ground boa (Acrantophis madagascariensis) portrait, Berenty Reserve, Madagascar

Michael D. Kern / Dumeril's ground boa {Acrantophis dumerili} captive, from Madagascar

Nick Garbutt / Madagascar ground boa {Acrantophis madagascariensis} on forest floor, Lokobe NR, Nosybe, NW Madagascar

Nick Garbutt / Madagascar boa constrictor {Acrantophis madagascariensis} Lokobe Reserve, North West Madagascar