Flying Deer

So we're driving to school this morning just before sun- up. A deer ran across the road in front of us so I braked a bit.
"What was that?" Gabe asks.
"A deer," I replied. "I slowed down so I wouldn't hit it."
"It can just fly," Gabe says.
"Deer don't fly," I tell him.
"Oh yes they can! Santa Claus said so!"