The first and second instar of the larvae of the Papilio homerus (the Homerus swallowtail or Jamaican swallowtail) resembles bird droppings which are thought to provide a selective advantage as to avoid predation.
Papilio homerus, the Homerus swallowtail or Jamaican swallowtail, is the largest butterfly in the Western Hemisphere. The first and second instar of the larvae resemble bird droppings, with a dark brown body and a white lower abdominal region. This is thought to provide a selective advantage as to avoid predation. 
