When I was a missionary in Germany many years ago, I learned that German roosters do not say "Cock-a-doodle-doo!" They say "Kikeriki!" It never occured to me that different cultures would reproduce the sounds animals make in such a completely different way!
Last year I somehow stumbled on the coolest website called BzzzzPeek. Their mission is to record children all over the world making animal and vehicle sounds so you can hear and compare them. And it is the cutest site!
For instance, in Croatia a dog says "vowvow" and in Japan a cat says "miamia".