Adult dragonflies will eat any insect as long as they are able to catch it. While they usually eat mosquitoes and midges, they also eat butterflies, moths, beetles, bees, flies, and even other dragonflies. The general rule is that larger dragonflies will eat insects of body weight daily.
Origin of the name Viola: Derived from the Latin viola (a violet). The name has been in use since the Middle Ages but did not become common until the middle of the 19th century when the use of flower names came into vogue. From A World of Baby Names by Teresa Norman.
Violas can be every bit as agile as the other Strings and since the 19th century viola writing has just as demanding as that for the other string instruments. The viola is the alto voice of the String family. It is larger than the violin, and its lowest note is a perfect 5th lower than the violin. A typical symphony orchestra will have twelve violas seated two to a desk for a large orchestral work. Construction The viola looks like a large violin and in terms of its construction it is more or less the same. In common with all string instruments, there are no fixed dimensions for a viola and both players and makers will have their own preferences.