We have what looks to be two juvenile (female?) black-chinned hummers that have not left our yard as yet. We still have feeders out. It snowed the other day and we've had temps in the low 30's at night.

Any advice? Keep feeders up, I know, but should we up the sugar content? Have read 2/1 instead of 4/1? Has anyone experienced this and they've left, just super late? Other hummers left beginning in mid-August.

Thanks for any advice.