There's only one male and three females.There are some very perceptive and observant people inhabiting this forum.
After much searching, and eye strain, I realised one of the blades of grass is fake. Which one, I leave as an exercise for the reader with too much time to spare. 
He's a she!!The one on the left has had its face obscured to protect his identity.
only because its having a wash and wax at the local swim throughThe one in the water has no head?