Why do ducks have flat feet?
For stamping out forest fires.
Why do elephants have flat feet?
For stamping out flaming ducks.
Why do giraffes have long necks?
For spitting on burning elephants.
Source.
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How are an elephant and a banana just alike?
They are both yellow . . . . uh . . . . Except for the elephant, of course.
What did Tarzan say when he saw a herd of elephants coming over the hill?
Look! A herd of elephants coming over the hill!
What did Tarzan say when he saw a herd of elephants wearing sunglasses coming over the hill?
Nothing. He didn’t recognize them.
What did Jane say when she saw a herd of elephants coming over the hill?
Look! A bunch of bananas coming over the hill! (Jane was color-blind.)
Something should go here, maybe later. 
Mr Seven thought those were hilarious!
Q- What does Tarzan do when an elephant comes through his window?
A- Swims!
My memory tells me that this was part of this series too.
Q: Why do elephants have flat feet?
A: For stamping out flaming ducks!