Greenfinch

I went for a long walk around the nature reserve. 
I heard a bird call I didn't recognise so used an app to ID it. The I found it up in the tree above me. A greenfinch. I'd never recognised its call before.
Then another birdsong started, all different notes and patterns.
My app failed me though as it said it was a northern mockingbird.
Clearly no, it was a song thrush. But it didn't let me photograph it.
Not much else to report from my day.