Why use shotgun for hunting?

I asked a gun expert why people use shotguns for hunting, instead rifles. And he replied :
"Shotguns are generally used for hunting birds, which fly very fast. It would be very difficult to hit a flying bird with a rifle. It would also be very dangerous to fire a rifle up into the air."
I’d like to know your opinion on his answer please. I mean tell me what’s exactly the danger of shooting a rifle up into the air, etc.

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