Eastern Tailed Blue

Eastern Tailed Blue (Cupido comyntas)

You can't see the tail very clearly in this picture unless you click to enlarge it, but one thought I had is that the tail might be a form of camouflage so that predators would not know which way the butterfly was facing. With the large black spot right by the tail being the false eye, and the tail being a false proboscis, the area behind the orange patch forms a crude head. Well, perhaps not a very good likeness, but then it isn't trying to fool Sherlock Holmes.