Bats and Turtles

"Mummy, are some people Bats?"
"How do you mean?"
"Well, do some people sleep all day?"
"Some people who work night shifts do."
"So they work all night and go to bed during the day?"
"Yes, that's right. It depends what kind of job you have."
"OK. So they're like Turtles."
"Turtles?"
"Yes, Turtles are awake all night."
"I thought that was Bats."
"Yes, Bats and Turtles."
"Are you sure?"
"Yes we learnt about it at school. Bats and Turtles - they sleep during the day and are awake at night."
"Hmmmm. I don't remember learning that Turtles are..........oh, I see. Did you learn about some animals being NOCTURNAL?!"

God love him!