From Oh My Darlin:

We are invertebrates, we are invertebrates,
we have no bones, we have no spine,
we are insects like rolly pollies
worms or spiders or butterflies
sometimes we like to crawl just like a little snail, calling us a mollusk
some of us have many legs calling us an octopus
sometimes we like to pinch just like a little crab, crustaceans is our name
or we stick to rocks and ships like barnacles or starfish!
We are invertebrates we are invertebrates, we have no bones we have no spine!