Math Lesson as told by my three year old girl during breakfast.

"Mommy, there are three birds in the tree.  See one, two, three.  One flew away.  Look, there are one, two birds sitting in the tree.  Uh oh, two birds flew away.

I asked, "Now how many birds are there?"

Sophia says, " Mommy, there are no birds."

I said "No birds equal zero birds, right?"

A few seconds later she says, "One, two, three birds came back."

And there you have it a real world math lesson in birds.