Pheidole yeensis is a polygynous ant colony with a fast development speed and a colony size of up to 20,000 workers. The queen is 7-9 mm in size, while workers range between 3-4.5 mm and majors can be 4-7.5 mm. The ants have a chestnut color with varying intensity. They are fed a diet consisting of insect food, syrup, fruit, vegetables, jelly, and cooked chicken.