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Lasius japonicus is a species of ant belonging to the genusLasius, that are commonly found throughout East Asia.[1] The species has been observed spraying formic acid both defensively and offensively.[2] It is also known to tend to aphids in exchange for their honeydew secretions, and have been found to be far more attentive to their aphids then other similar ant species.[3] In appearance they are mostly black in color with a tinge of white on their gaster.