Each cone type contains a pigment sensitive to particular wavelengths of light. The range of colours an animal sees depends on the combination of colour-sensitive pigments in their eye and the ...

The smooth wings of fruit-sucking moths appear to be ridged like a leaf – but the resemblance is created by nanostructures ...

Some of the animals have been overdrawn several times ... Rocks were ground up to make pigments -- black and ochre were the main ones -- which were then sometimes applied to outlines of figures ...