"How large does a butterfly have to be before anybody notices it is disappearing?"-- The case of Alexandra's birdwing
A few years ago I was fortunate enough to visit (albeit for a ridiculously brief time) old growth forest in Sarawak. At night our field station attracted several Atlas moths. This huge being is actually quite common but for those of us who had never seen it before the sight was beyond astonishing, like a dream that had emerged from the shadows into our tiny circle of light.