Coccinellidae November depending on location and weather conditions. Homes or other buildings near fields or woods are particularly prone to infestation. After an abnormally long period of hot, dry weather in the summer of 1976 in the UK, a marked increase in the aphid population was followed by a "plague" of ladybirds, with many reports of people being bitten as the supply of aphids dwindled. The presence of coccinellids in grape harvests can cause ladybird taint in wines produced from the grapes. "Harmonia axyridis" (the harlequin ladybird) is an example of how an animal might be partly welcome and partly harmful.
Evolution of insects Plecoptera), each order has its own kind of tracheal gills that are so different from one another that they must have separate origins. This would be expected if they evolved from land-dwelling species. This means that one of the most interesting parts of insect evolution is what happened between the Thysanura-Pterygota split and the first flight. The origin of insect flight remains obscure, since the earliest winged insects currently known appear to have been capable fliers. Some extinct insects (e.g. the Palaeodictyoptera) had an additional pair of winglets attached to the first segment of the thorax, for a total of