Haiku:

[heslopian]

This will probably sound ridiculous, but to me the word "shat" feels too much like literary technique. It's slang, which puts it not a million miles away from metaphor. I think "shit" would sound better. The enjambment could also be changed to this:

"At my feet a lark.
It fell during summer thunder."

Overall though this is a funny and imaginative piece. I like the intrusion of narrative voice, adding humour to what is quite a tragic image. Thanks for the read, Bilbo