The black garden ant (Lasius niger), also known as the common black ant, is a formicine ant, the type species of the subgenus Lasius, found across Europe and some parts of North America, South America, Asia and Australasia. The European species was split into 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 normally range from 4,000 to 7,000 workers but can reach 40,000 in rare cases. 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, and then they will most likely fight until one queen remains. Under laboratory conditions, workers can live at least 4 years.
These ants are farming aphids.