At 00:07
It was singing regularly during the 10 minutes we spent in this plot.
Submitted to eBird since it's a significant early record. https://ebird.org/checklist/S169830359
It chased a pine grosbeak off my feeder and into the window which killed the grosbeak. It was very cautious around it's kill and moved in to eat a bit but was scared off quite easily. It then started to attack a squirrel that came in.