by John Ciardi
"The old crow is getting slow;
the young crow is not.
Of what the young crow does not know,
the old crow knows a lot.
At knowing things,
the old crow is still the young crow's master.
What does the old crow not know?
How to go faster.
The young crow flies above, below,
and rings around the slow old crow.
What does the fast young crow not know?