At the bottom of this photo, the two damselflies are under copulation. The head is male and the next is female. The male tail holds the back of the female head firmly, and the female tail joins to the male belly. Viewed from the side, they looks heart shaped.
The third damselfly which seems to be male is approaching from behind. In a moment, when I thought that a pair of damselfly moved, the third one went somewhere.
