The black garden ant (Lasius niger), also known as the common black ant, is a formicine ant, the type species of the subgenus Lasius, which is found across Europe and in some parts of North America, South America, Asia and Australasia. The European species was split into two species; L. niger, which are found in open areas; and L. platythorax, which is found in forest habitats. It is monogynous, meaning colonies contain a single queen. Lasius niger colonies can reach in size up to around 40,000 workers in rare cases, but 4,000–7,000 is around average. A Lasius niger queen can live for up to 29 years the longest recorded lifespan for any eusocial insect. Lasius niger queens in the early stages of founding can have two to three other queens in the nest. They will tolerate each other until the first workers come, then it is most likely they will fight until one queen remains. Under laboratory conditions, workers can live at least 4 years. (Source: Wikipedia.org, CC BY-SA)