Because their pecker is on their head.
An algeabra....
A very worn-out thuper hero. (An excerpt from Brother Time and the Turtle: More Excuses for Jokes: )
Toucan
Cheap cheap!
One guy threw down his hand and another laughed his head off. This was my best friend's favorite joke when she was little apparently.
A nun with a spear through her head.
The rest are hunting peckers.
Their peckers are on their heads.
A barracuchi.
It was a Freudian slip