Wren

Hello, lovely Moo!

You're so gosh darn good at poeting. I just look at your stuff and think to myself, "Dang, gurl, dat gurl is a great poeter."

I love the use of "oared" in the second line. It's so descriptive, yet you're able to use a single word.

becomes the case for a thrumming core;

I love how this line sounds, but I had to read it several times before I understood what it meant. I think the word that really made the line confusing was "case." It doesn't really say which bird's core is thrumming, and I think that "case" could be substituted for a word indicative of that, though that's your choice, and ultimately, I understood.

a hedgerow spirit I desire nothing more

This line and the conclusion of the sentence sound awkward to me. It might be because it's an inversion, but it doesn't quite feel right to me.

I feel that little cage break inside

You've used very loaded and descriptive words until now; "little" is a deviation from that. I think you should find a way to work a more beautiful word (as you've used throughout the poem) into this line.

I really like the last line. It's a beautiful way to end the poem. I don't know if you meant it to be a parallel for the bird's call, though, as a kestrel sounds like this. I feel that keening is more of a long cry, and was thinking that you could find a slightly different word here to reflect not only the emotion, but the sound a kestrel makes (which is quite annoying if you've been woken by one at five in the morning).

Altogether, this is just lovely, and the misunderstandings may very well be my own fault. I hope this review proves useful to you! Happy poeting!