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The thoraces of males and flightless females of the geometrid winter moth Nyssiodes lefuarius are described, documented in detail, and compared. Morphological, functional, and evolutionary aspects of the female phenotype are discussed. The flightlessness of female N. lefuarius is linked not only with complex modifications of the skeletomuscular structure, especially elements of the flight apparatus,...
Protective colouration in animals includes camouflage (i.e., crypsis), that decreases the risk of detection, and conspicuous colouration, which is often used in combination with chemical defences to deter predators from attacking. Experiments have shown that the efficacy of conspicuous colouration increases with increasing size of pattern elements and larger body size. Prey species that have acquired...
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