Pine Siskin Invasion?

This morning I was surprised to find a couple of Pine Siskins at our feeders (#74 for the year list). We've had siskins here before, but that was during an invasion year. These are the first I've seen this winter, and I doubt they are part of any larger movement. If an irruption is going on it hasn't been very well publicized.

Temperatures continue to yo-yo. At the moment we are in a cooling trend, with lows expected to dip into the 30s - cold, but not exactly the icy death-grip of winter. Earlier this month it was warm enough that geckos were crawling over the outside of our house at night. Such is the extremely variable nature of Southeast Texas weather.