Adults
Many geometrids have slender abdomens and broad wings which are usually held flat with the hindwings visible. As such they appear rather butterfly-like but in most respects they are typical moths: the majority fly at night, they possess a frenulum to link the wings and the antennae of the males are often feathered. They tend to blend in to the background, often with intricate, wavy patterns on their wings. In some species, females have reduced wings (e.g. winter moth and fall cankerworm).
Most are of moderate size, about 3 centimetres (1.2 in) in wingspan, but a range of sizes occur from 10–50 mm (0.39–2.0 in), and a few species (e.g., Dysphania) reach an even larger size. They have distinctive paired tympanal organs at the base of the abdomen (lacking in flightless females).
Read more about this topic: Geometer Moth
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