Animal Sounds

Ben has known that animals make certain sounds since before he could talk. This has not changed only the way he puts everything together. We were driving home yesterday down 28 which is nothing but cow farms. The conversation went like this.....

Mommy: Ben look there are cows.....what do cows say?
Ben: MMMOOOOO. (pause) Cows say mmooooo.
Mommy: That's awesome Ben what do pigs say?
Ben: (an oink like sound). (Pause) Pigs say oink oink (same sound as before).
Mommy: Great!!

We then go through sheep and then ducks. then........

Mommy: Great!! What does birds say?
Ben: Teet Teet. Birds say teet teet. (pause) Where birds go?