Baby Camel: Mum, why do we have such a huge hump?
Mum Camel: They're for storing fat out in the desert.
Baby Camel: Why do we have hooves, then?
Mum Camel: So our feet don't sink into the hot sand.
A moment later...
Baby Camel: Right. So why do we have all this stuff if we live in the London Zoo?