Insects are highly developed to respond to smell. The fruit fly, *Drosophila melanogaster*, has genes for over 50 odorant-binding proteins which can be found [here](https://motif.mvls.gla.ac.uk/FlyAtlas2/index.html?search=group&groupID=FBgg0000175) and genes for over 120 [chemoreceptors](https://motif.mvls.gla.ac.uk/FlyAtlas2/index.html?search=group&groupID=FBgg0000119), which include both odorant receptors and gustatory receptors. 

There is a link to the [FlyBase](https://www.flybase.org) entry for each gene where further information can be found. 

There is less information about other insects, but indications are that each has a large repertoire, honed to its particular sources of food.