Ku-Ku bird

This is what happened yesterday....
Early in the morning, Jo1 woke up and straight to the toilet to wee and Jo2 rushed to me and told me that jie-jie's ku-ku bird is lost. "HIS" ku-ku bird is in the toilet bowl, so "cannot find-lo."

At night, my boy spoke his first sentence in mandarin to me (after 4 days of learning Chinese @ nursery), and it's all about ku-ku bird again.
Jo2: mommy, "wo de peng you you ku-ku bird......." (My friend has penis)
Mommy: Only boy has ku-ku bird, ok.
Jo2: Jie-jie no ku-ku bird. Lost in the toilet bowl oredi.
Mommy: No, jie-jie is a girl, so she doesn't have ku-ku bird.
Jo2: How about u, u have ku-ku bird?
Mommy: Mommy is a boy or girl?
Jo2: Girl. So daddy has ku-ku bird, he is a boy.
Mommy: ya-ya, that's right.