These ants have workers that are different sizes

Red imported fire ant

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Red imported fire ant stinging - they also bite! (© Alex Wild

African big-headed ant

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African big-headed ant large (major) worker (© Alex Wild

Tropical fire ant

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Tropical fire ant worker (© Alex Wild

Singapore ant

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A close-up of a Singapore ant worker (© Eli Sarnat, Creative Commons Attribution, Share Alike CC BY-SA License)
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