I don't have web feet

I over heard this conversation last Sunday, while we were waiting for the bus ...

爸爸: Can you swim?
哥哥: No, cannot?
爸爸: Why cannot?
哥哥: Because I don't have web feet! That's why chicken cannot swim lor. They don't have web feet. Only duck can swim. They got web feet.

Gee ... let me take a look at my feet ... maybe I got web feet. LOL