I think it's a female Tree Bunting. I've used the 400mm DO II a lot on the R5 and I got better results with the the 100-500mm at 500mm than the bare 400mm at the same distance. The 400+2xTC was better than the 100-500mm at 700mm with the 1.4x, but with the RF 2x, the 100-500mm at a 1000mm has the edge in reasonable light. If an RF 400 with an RF 2x outperforms the 600-1000mm combo, I could be tempted.
I will buy the 1,4 tele converter to the 400 and try that combo out for a bit 560mm reach with f/4 seems good.
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