π.

I asked Bluebird: Have you seen π?

Bluebird chirped: Too-whee, twee twee twee!
and flew away.

I asked Squirrel: Have you seen π?

Squirrel chattered: Brrrrrip, brip, ch-ch-ch-ch-ch!
and scrambled higher in his tree.

I asked Deer: Have you seen π?

Deer snorted: Bhrrrrrrumph!
and switched its white tail in my face.

I asked Daddy: Have you seen π?

Daddy smiled: There it is, on the dinner table - Mommy's homemade apple π!