Size: 2.5*6 cm
Size: 2.5*3.5 cm
Material: zinc alloy, gilded, enamel
The story behind Darwin's hypothesis: The species Xanthopan morganii praedicta, named in honour of its predicted existence by Charles Darwin and Alfred Russel Wallace, exclusively pollinates the Madagascar orchid, Angraecum sesquipedale. The proboscis of this hawk-moth is long enough to reach the nectar receptacle of the orchid, which is between 20 and 35 cm (8 and 14 inches) in length.