Outside of Wikimedia Commons, I can’t find a good source for scientific illustrations of their faces, but if you have a solid internet connection, there’s always the CSIRO fly atlas, at least for, like, houseflies. Wait for the lens to load up and click on Calyptrate, and click on “anterior” after the lens loads again.
There’s almost certainly something at Diptera.info, but I don’t really wanna go through allllll the damn flies. THERE ARE TOO MANY FLIES.
This is true, though the “shivering” is actually internal, so one would not be able to detect it while watching a bee from the outside. Bees can raise their temperature from 13 C to 37 C in just six minutes, which is incredibly fast in the insect world.
However, there ARE other insects that regulate their own body temperature - many moths will vibrate (“shiver”) their proximal wing muscles to warm up their thorax and abdomen, before they take off. This is a mechanism very similar to the internal warming of the bees, and is required in order to “start up” at night, when the ambient temperature is often low enough to keep most insects and other cold-blooded animals in a state of torpor.
Nope! However, some of the scorpionflies (a minority) have well-developed wings.
There are also other species that mimic a scorpion tail or stinger on their body that have wings, and there are a couple pseudoscorpions that hitchhike (phoretically) on flies, which can make a fly appear to be scorpion-like.