This is my Formica cf. fusca colony.
The identification topic:
Eventually this colony raised ten workers. After that, they kicked one queen out which later died.
After hibernation they had 7 workers. I took them out late January. They already had one worker eclose which pushes them up to eight. They ate a pupae and a larvae in an acrylic nest I bought from AntKit, presumable due to lack of hydration. I have since moved them into a test tube.