Formica montana is an extremely aggressive and dominant species of ant within the fields and meadows of central North America. In fact, it's frequently able to drive out other species of ants, or change their behaviours to favour more timid foraging strategies. The first time I had a colony of this species, I admit I was a bit disappointed, since the workers were tiny and didn't show the red sides more typical of this species (these workers are pictured below). However, as the colony grew, I found the worker size nearly doubled, and the red became prominent in many workers. Formica montana, like it's relatives, is very polygynous, but only accepts queens in the founding stage. Personally, I've always loved the silver/red aesthetic of the larger workers
This is our collection of most of the field ants, or Serviformica. These are large, silver at queens from 8-12 mm and workers from 3.5-7mm.
This product, for the sake of ease of navigation, also includes Formica neoclara
They grow large colonies up to 5000 workers in just 3 years. They prefer 22-26 Celsius and like around 50% humidity, though there is slight variation across species. They're more skittish than most ants, and so are of medium difficulty to start, but are extremely enthusiatic and fast growing once they break 50 workers. In the wild, Formica are some of the most dominant ants, hunting down other species and consuming large amounts of biomass. We get many of these each year, though the numbers are variable.