I found this blurb about them which is interesting:
The flight is low over the ground, skulking and phantom-like. The wing beats are deep and slow, but the butterfly is capable of moving rapidly if disturbed. Upon settling it usually turns quickly around, and tilts slightly forward so that the “false eye” on the underside hindwing is raised. This ocellus, together with the bright pink area, and the oval shape of the hindwings, may function to simulate the head of a small snake, deterring any bird, reptile or amphibian that detects where it has settled.