I was able to sex the juvenile Starlings using their eye colour. The male birds have an all dark eye, whereas the females have a pale ring around the eye.
Male Starling
Female Starling
The two ringed Starlings that I managed to catch were very interesting. The first bird was an adult female with a very well developed brood patch (indicating breeding), and, when I read the ring, turned out to be a bird I'd caught in the garden in 20th May 2018. It had a brood patch then too.
The second ringed bird was a juvenile, and turned out to be one of the four pulli I'd ringed in May in the nestbox on the side of my house (see here). This bird was the only one of the 6 juveniles caught this morning to have started its post juvenile moult, as seen in this picture below.
Starling with a few adult feathers
It could also be sexed as a female, using the eye colour.
Female Starling
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