Haiku Crawl

Today I was reading haiku to Benjamin from the book Yum! MmMm! Que Rico! America's Sproutings by Pat Mora. I guess he just really liked the bright and colorful illustrations by Rafael Lopez because he started reaching for the book like crazy. I didn't want him to touch it because it's a library book (yucky!), so I pulled it a few inches out of reach. The next thing I knew,
he was crawling toward the book as I dragged it further and further away! Crawling! I can't believe he's such a big boy. Jon came in while he was still doing it, but we haven't been able to get him to do it again. At least we know he can!

Anyway, I wrote the following haiku for him:

On your hands and knees
Rock forward, push up, and crawl
Mommy is so proud!

Incidentally, is the plural of haiku still haiku? Or is it haikus?