A bird who knocks before delivering its message !
Crumbs!
Knock on the door
A harenet.
The punchline for this joke is 0.99$
Rustled Crow
A penguin.
Santa Jaws !
Two large plains.
By referee-mail.
You have to drop the bomb twice before she gets the message.
A bird that talks in morse code !
Because the woodpecker.