We have at least three varieties of dragonfly - broad bodied Chasers with bright blue tails, blue and green Emporer's and a copper coloured Common Darter. The habbits of the chasers are different to the emperor. They inhabit a particular part of the bank and the bright blue males pose for the females on a reed or a rock. Females that are attracted fly close and the male the couples with them in mid air and off they fly to procreate. I haven't managed to watch an emperor dragon fly mate but today I managed to film one laying her eggs in the water.
We also have beautiful blue, green and red damselflies with males and females staying connected tandem style to aid the reproductive process.
Its possible that different species appear at diferent times so I shall keep watching.