B-Road Boxing

[Magpie]

A wagtail bobbed into my ring,
buffeted on mondeo's wing,
winded by cheap body shots,
steel wheels and headlight hooks.

Judges couldn't mark his card,
both parties went in really hard,
weight advantage nearly broke,
the delicate body on the ropes.

Pied fighter rolled and hit the floor,
fledgling fans can't watch much more,
one arm flaps, a cut loose sail,
feathers fall, a thrown in tail.

Before the count car body lurches,
slams itself on tree lined hedges,
spits out soil twists and bounces,
bird limps away backward glances.

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Hi I really enjoyed reading this and have read it several times now mostly to see if I could find something where I could say it could be improved but alas I can't seem to find anything. Which is probably not much help critique wise.
The boxing analogy is very good right from the start. It's a great first line especially with the word "bobbed" it sets it up straight away as a boxing match, I presume the wagtail is a "featherweight". And the other excellent part was the "thrown in tail" clever play on words.
I personally think it's a very good and clever poem. Sorry if this isn't of much use. I would of been tempted to use "featherweight" in there somewhere but it's not as subtle as your references.
Cheers for the read, I really enjoyed it.