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What I also found interesting was the considerable size difference between the male and the female and also the impressive red colouring of the female.
As an aside, I took these images using my back-up body which is a Canon 60D (with a 60mm macro lens). Since I had to shoot these handheld and because the light was failing I raised the ISO to 1000 to get a high enough shutter speed for sharp images. However I was very impressed with the resultant image quality which shows relatively little sign of noise. I did get the exposure about right which certainly helps to reduce noise but in future I won't be too concerned about raising the ISO on this body in order to get sharp images.