"Mom, what is a red bird called?"
"Well, a red bird could be called a cardinal. Or a parrot. Or a robin."
"Yes, robins have red tummies and brown backs. And they are one of the signs of Spring!"
"A sign of Spring? Hmm ... but I thought they were real birds!"
"They are real birds!"
"But how can they be real birds if they are signs? Signs are made of wood! Silly Mom."
This way to Spring.