How do you know that?

Jade has really taken a liking to puddles and insists on running through or jumping in every puddle she finds - no matter how big or small they may be. The other day, we were playing in the puddle at the end of our yard when my neighbour's great-granddaughter came over. She's four.

As my neighbour's great-granddaughter was chatting away, she brought up the topic of dog poo - something that there is still no shortage of in my front yard.

She said, "I don't like dog poo. I don't eat it."
To which Jade (age 2) quickly responded, "Yuck."

Now, I've never seen Jade attempt to eat poo of any sort. Is the knowledge that poo is "yucky" instinctual?  I once knew a kid that ate dog poo all the time. Did he know something that the rest of us don't?  I wonder if he still snacks on it once-in-a-while.  I've got a yard full that he can help himself to.  Maybe I can find him on facebook...