Obrina Olivewing butterflies are very unusual because they are one of the few animals with actual blue pigment. Most other species get their blue coloration from a process called
coherent scattering, in which scattered light waves interfere to create a blue color. All the other species of
Nessaea get their blue coloration from the pigment
pterobilin. Pterobilin also provides blue for
Graphium agamemnon,
G. antiphates,
G. doson, and
G. sarpedon. Other butterflies in
Graphium and
Papilio (specifically
P. phorcas and
P. weiskei) use the blue pigments
phorcabilin and
sarpedobilin. ==Subspecies==