All ants have a distinct, narrow “waist”. The black ant is 2.5 to 3mm long, black in colour (surprise). The coastal brown ant is light brown in colour, dimorphic with small minor workers (1.5 to 3mm) and larger (3.5 to 4.5mm) major workers with very large, darker heads. Males have wings; females have wings until mating then remain the reproductive queen ant. Worker ants are sterile and exist to serve the colony while soldiers protect the nest from predators. Larvae are a whitish grub that narrows towards the end.
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