Goldfinches - not that I'm aware of. I believe that the red and white on their face doesn't develop until they mature as an evolutionary way of helping them avoid predators. Without the red and white face they can be a bit more hidden until they have better survival instincts. Then in later life I think the vibrancy of the red is involved in mate selection. But differences between the sexes not that I know of.
This is what I tend to get in my garden
Plentiful: Goldfinches, Sparrows, Blackbirds
Common:Bluetits, Robins, Green Finches, Chaffinches
Once in a while: CoalTits, GreatTits, Starlings, Magpies, Crows
Rare: Siskins
OMG WTF is that: Sparrow Hawks
Think that's everything
I sometimes wish we could see the extra colours as I feel birds would probably look even more spectacular.
That's a decent amount of birds! We get a lot of GreatTits and Magpies in my garden. The magpies in particular enjoy making noise right out the window at about 6am. I am determined to befriend them though!
Don't think I've ever seen a sparrow hawk in the wild but my partner got me a bird of prey experience for my birthday in December where I got to fly a few different owls and a Harris Hawk (who decided my head was a nice place to sit!) and they had a little sparrow hawk there but he wasn't ready to be flown that day.
If I ever move to the country I'd love to take up falconry
