Two Turtle Doves?

My family, looking at an exhibit: "Look! Two two turtle doves!"

Me: "Hmph. Those aren't turtle doves."

Beautiful Wife: "They aren't?"

Me: "Look at them. They're just doves. No shells."

Beautiful Wife: "Turtle doves don't have shells."

Me: "Of course they do. The shells are great protection from predators. Especially when the doves pull their wings inside their shells."

Secondborn: "Daddy--"

Me: "I'm serious. On the small island-nation of Begonia, they're considered quite the hazard..."

Firstborn: "What?"

Me: "...Because if they're startled, by groups of Christmas carolers for example, they'll sometimes pull their wings into their shells in mid-air. Falling turtle-doves can be very dangerous. People have died."

Beautiful Wife: "Begonia?"