Insects can detect a large range of odors with a numerically simple olfactory system that delivers high sensitivity and accurate discrimination. Therefore, insect olfactory receptors hold great promise as biosensors for detection of volatile organic chemicals in a range of applications. The array of olfactory receptor neurons of Drosophila melanogaster is rapidly becoming the best-characterized natural nose.
Marshall, B. K., Warr, C. G., & de Bruijne, M. (2010). Detection of volatile indicators of illicit substances by the olfactory receptors of Drosophila melanogaster. Chemical Senses, 35(7), 613 - 625. https://doi.org/10.1093/chemse/bjq050