WHILE EATING CUSTARD PIE

Little cat swung
on a crescent moon
singing a jolly,
happy tune.
She sang low,
she sang high
to the stars
in the moonlit sky.

     I went to sleep last night thinking about this poem.  Originally the poem was an excuse to use the line while eating custard pie. But as the night wore on, I rewrote the poem to a Halloween poem with pumpkin pie, and this morning in a brilliant job of editing, I got rid of the pie. (How can you sing and eat pie at the same time?  It is like eating crackers and trying to whistle.) So then I rearranged the lines and ended up with an a-a, b-b rhyming pattern.  I did try a,b, a, b, but I didn't like that as well.  I could have used longer (fewer) lines, but I like these shorter lines for early readers.  You could make the argument that my rhyme scheme now is a, b, c, b for two stanzas, but I'll hold with the idea that what I really have here is rhyming couplets.  I have this theory that most rhyming children's poetry is written in couplets and the a,b,a,b pattern is really a couplet with internal rhyme.  Any comments?
       Your poetry challenge is to write a poem about an animal in the sky. (A Rhino in the sky with diamonds, maybe.)  Have fun writing.