It gets ridiculously hot where I live. It's been fairly pleasant lately but that'll change when summer comes.
The hottest day on record in my city was a few years back now but I remember it well. It was a fairly dry heat but back then we didn't have any air conditioning in the house, so boy did we suffer!
I'm not sure of the exact measurement but I remember the news reporting that it had reached something on the order of 48 or 49° Celsius. For the Americans, that's about 120° Fahrenheit.
Actually, I saw something strange that day and it's never occurred to me to ask about it here.
Under the house (the "garage" I suppose; the car, piles of junk, etc) that day, we found the largest congregation of flies I've ever seen. And I'm not kidding; I didn't know there were that many flies in Australia!
They were like a blanket. They covered everything so thickly you couldn't see a surface anywhere. They were pressed wing-to-wing and if you put your hand down anywhere, they exploded into a thick cloud in all directions. I've honestly never seen anything like it.
So as obvious as the answer may seem, I just want to clear it up; why? Do flies just seek shade in extreme heat? It seems obvious but the reason I ask is because we've had hot days before (not as hot as that one, but close) and I'd never seen anything like that. Never seen it since, either.