The state's most important rivers are the Missouri, rising in southwest Montana and flowing north and then east across the state, and the Yellowstone, which crosses southeastern Montana to join the Missouri in North Dakota near the Montana border.
Habitats. Hoverflies can be found in every biotope but not in deserts. Each species tends to prefer a certain type of habitat and is limited to a distinct range within the country. There are relatively few species with broad habitat tolerances that enable them to be distributed throughout southern Africa.
Hoverflies and other Flies. 1  The Diptera (Flies, including Hoverflies) is a large order of insects. 2  The name means 'two-winged'. It is a reference to the fact that flies only have two wings, whereas bees and wasps have four wings. 3  The adults of a number of types of flies will drink nectar as well as taking other foods.