Are thrushes nightingales? Are nightingales thrushes?
I can answer this at least: no. (Though the nightingale did used to be classed as a member of the thrush family.)
Are thrushes nightingales? Are nightingales thrushes?
Previsously, I've always worried that my references were too poor or obscure, so I'd rapidly give clues. This time I was determined to leave it alone.
Quite right. I can't speak for anyone else, but when first reading your challenge I was dismayed by the amount of knowledge (or work) that I thought were needed. When I took another look today and remembered there were family trees in TS, it proved fairly straightforward.