Pair of Siskins Feeding
As both Male and Female Siskins were on the Nyger Seed Feeder (which needs another topup!) I took a photo to show the differences between the two.
The Female is on the left and Male on the right.
As you can see, the difference is quite visible. The Male has a real black cap and has a lot more yellow colouring than the female who has a lof of white.