David Pattyn / Orchids (Angraecum sp) flowering, tropical lowland rainforest. Masoala NP, North eastern Madagascar. August

David Pattyn / Orchids (Angraecum sp) flowering, tropical lowland rainforest, Masoala NP, North eastern Madagascar.

Chien Lee / Comet Orchid (Angraecum sesquipedale) flowers, Canal des Pangalanes, Madagascar

Nick Garbutt / Orchids (Angraecum sp) rainforest understorey, Andasibe-Mantadia National Park, eastern Madagascar.

Barrie Britton / Darwin's Orchid (Angraecum sesquipedale) species which is pollinated by a long-tongued moth, from Ambila, Madagascar. Photograph taken on location for BBC 'Wild Madagascar' Series, August 2009.

Barrie Britton / Darwin's Orchid (Angraecum sesquipedale) species which is pollinated by a long-tongued moth, from Ambila, Madagascar. Photograph taken on location for BBC 'Wild Madagascar' Series, August 2009.

Barrie Britton / Darwin's Orchid (Angraecum sesquipedale) species which is pollinated by a long-tongued moth, from Ambila, Madagascar. Photograph taken on location for BBC 'Wild Madagascar' Series, August 2009.

Konrad Wothe / Comet Orchid (Angraecum sesquipedale) flowers, Madagascar

Inaki Relanzon / Comet Orchid (Angraecum sesquipedale) epiphytic on rainforest tree, Madagascar.

Inaki Relanzon / Unidentified colourful starfish, Anakao, South Tulear, South Madagascar, May

Pete Oxford / Comet orchid (Angraecum sesquipedale) Analamazoatra Special Reserve or Perinet. MADAGASCAR, pollinated by a moth with a proboscis of 12 inches {Xanthopan morgani praedicta} endemic

Nick Garbutt / Giant comet orchid {Angraecum sequipedale} eastern Madagascar.