Discriminations

I did speak with someone not long ago who said he couldn't tell the song of a willow warbler from that of a chaffinch. Once you know it inevitably you forget the process you yourself went through and the learner is going through now, so it's easy to scoff.
It's about discrimination of course but then there are those I've come across who don't understand the word discrimination itself; they think it means being unfair or prejudiced!

The more tricky identification problems may be about differences between the songs of garden warbler and blackcap.

And telling a linnet from a redpoll.