I Have Lice

Schoolwork comes home every Friday. Today a poster of Little Z's came home, one of those all about me I'm so special pieces that only work if you're fewer than nine years. Here I show you the top of the Z:

"What does that say?" I asked.

"It says, 'I have lice,' and look at the cute little lice I drew!"

"But you don't have lice!"

"No, I don't have lice, the Z has lice. The Z is a snake, and the snake has lice in his hair, see?"

"_______!"

"They're so cute, the little licies... What is a lice, anyway?"