This is a large-sized Asian ant species, similar to Camponotus vagus. Monogynous (single-queen), claustral, polymorphic species, there are three worker castes (minor, media, major). Their workers are large, robust and strong. Camponotus japonicus has velvety black color, covered with silver hairs on its body. In addition to powerful mandibles, they defend themselves through acid spraying. These ants are aggressive, have strong bite, although they are not dangerous to humans (they can not penetrate the human skin). They can tolerate drier environments well. They become more active and develop faster in warmer conditions, but too much heat may make them to become passive. They establish colonies consisting of a few hundred to a few thousand workers, digging their nests into the soil, and workers are looking for food both at ground level and treetops. In case of danger, workers alert their companions by knocking with their heads. The expected lifespan of the queen can reach 10-15 years.
Feeding: Honey and insects.
Colony size: The colony reproduces slowly in the beginning, they raise 10-20 workers in the first year, but from the second year, they can reach a population of 100 workers. The colony is timid while having only a few workers. As the colony grows bigger and bigger, they become bold and deffend their territory agressively. The mature colony consists of a few hundred workers, but some sources mention that they can reach up to a few thousand workers.
Hibernation: They do not require hibernation, only little rest period from November to February at room temperature. For more information about hibernating, watch this video.