Because he was a-thinking.
“Pee-wit! pee-wit! Yes, that is it!
Pee-wip, pee-wop, pee-wee!”
Three little birds
Sat upon a bough.
The first said, “When is dinner-time?”
The second said, “Now!”
The third said nothing,
(The middle one was he,)
But sat there a-blinking,