Hello, Everglade, welcome to the forum.
At first glance, they are as alike as two peas in a pod. But over time, the eye gets used to it and notices that they are different. Males are smaller, females are larger. When they are both on the nest, this is clearly visible.
The "apron" pattern on the chest. Iiris: it rises almost to the beak, males: only on the chest.
I have never distinguished by the iris of the eye, the lighting and angle of the picture are constantly changing, the distance is different, and such a subtle detail easily escapes.
You can distinguish by habits: there are things that the female never does and vice versa, the male never does. This comes with time, only in the second year I was able to distinguish them immediately, as I saw. But in the beginning, they were all the same.
As for the appearance of the three inhabitants of this nest, they are easy to distinguish by appearance. They are very different. I posted pictures, they help to distinguish them.
