Why are we here?

     A mother and baby camel are talking one day when the baby camel asks, “Mom, why have I got these huge three-toed feet?”
     The mother replies, “Well, son, when we trek across the desert your toes will help you to stay on top of the soft sand.”
     “OK,” said the son.  A few minutes later the son asks, “Mom, why have I got these great long eyelashes?”
     “They are there to keep the sand out of your eyes on the trips through the desert.”
     “Thanks, Mom,” replies the son.
     After a short while, the son returns and asks, “Mom, why have I got these great big humps on my back?”
     The mother, now a little impatient with her son replies, “They are there to help us store water for our long treks across the desert, so we can go without drinking for long periods.”
     “That’s great Mom, so we have huge feet to stop us sinking, and long eyelashes to keep the sand from our eyes, and these humps to store water, but Mom...”
     “Yes, son?”

     “What the heck are we doing in the zoo?”