Any moth belonging to the family Geometridae, often called inchworms or measuring worms because of their characteristic looping movement.
From 'geometry' (Greek 'geometreia,' measuring the earth) plus the taxonomic suffix '-id,' because the caterpillars move in a way that resembles measuring with a ruler.
Geometrid moths are called 'inchworms' because their caterpillars move by doubling up and stretching out—they literally measure the space they cover like a geometric ruler!
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