A penguin.
Tweet!
Prisoner: For a lark sir.
A degree in law.
A first aid kitty !
Because they're too high-strung. Corny I know, but I wrote it myself and had to put it out there.
One to read, one to write, and one to keep an eye on the two intellectuals.
Sir. Groan worthy penguin jokes(https://allwrong.wordpress.com/2007/10/05/penguin-riddles/)
Because it is part black.