basically those animal are too bored on the jungle, till the Jaguar comes with a great idea to have fun...
the idea was that everyone tell a joke but if not EVERYONE laughs the one who told the joke will receive "Pamba" (lots of punches in the head) -i know thats cruel- ... so as you can see every one laughs except the turtle... in the end the turtle laughs before the toucan finish his joke, and says "har har har! the joke of the crocodile was hilarious!"
I know its stupid, but hey the turtles are slow for everything :P
P.S. its funnier in spanish