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Wood ant ocelli. Coloured scanning electron micrograph (SEM) of the top of a European red wood ant's (Formica polyctena) head, showing its simple eyes (ocelli, dark). As well as two large compound eyes ant have three smaller simple eyes. These ocelli cannot focus or see in colour, but are very good at detecting difference in light intensity. Magnification: x47 when printed 10 centimetres wide.
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