The camel and the sphinx

The sexual urge of the camel, 
Is greater than everyone thinks!
At the height of the mating season
He tries to bugger the Sphinx!
But the Sphinx’s anal passageIs filled with the sands of the Nile,
Which accounts for the hump on the camel
And the Sphinx’s inscrutable smile!
Now recent exhaustive researches
By Haldane and Huxley and Joad
Have shown the camel will bugger 
Any beast from a whale to a toad, 
Excepting the African hedgehog, 
Which Huxley and Haldane have shown 
To possess an immunity factor, 
Which is found in that species alone.