A camel.

[Keith Dean]

A camel and his son are grazing. The
younger camel looks up to his father and
says: "Dad, why have we got these great big
humps on our backs?"
The father camel looks down on the son
and says: "Well, son, it is so that we can
travel for miles in the desert without stopping
for water."
The young camel listens intently and
says, "Wow, I never knew that!"
A few minutes later, the younger camel
says: "Dad, why do we have really thick
eyelids?"
The father answers, "To protect our eyes
so that our pupils are not scratched by
sand storms."
"Wow!" the young camel says.
A couple of minutes later the younger
camel says: "Dad, why have we got such
huge feet?"
"Well, son," the father camel replies, "we
have to walk over sand dunes and because
our feet are big we can travel much more
easily."
"Wow," says the son. "Dad, what the f##k
are we doing in a zoo, then?"