“A penguin’s not a mammal is it?”
“No.”
“I didn’t think so.”
“Why?”
“My social studies book says it is, that penguins and polar bears and other mammals live in the Arctic.”
“Wait. I thought polar bears lived in the Arctic and penguins lived in the Anarctic.”
“B., I’m learning that penguins are mammals. How am I supposed to know where they actually live?”
“Good point.”