I like the tone and what I take to be the overall concept, and I like "crink."
I agree that most people know amoebas don't have tails, but most people don't know that the poet knows, so most people will just think it's an error. There's nothing in the poem to signal that it's being said as a joke. And even if I took it as a joke, it's a joke that feels out of place in the rest of the poem and distracts from the whole.
I'm not sure I get the final stanza. Maybe my issue is with "coexist," since the creatures you mention already do coexist, don't they? I think maybe "coexist" needs some sort of modifier to tell us the particular kind of coexistence that you wish to highlight.
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