Raven. How do differences between raven and crow shed light on poetry and prose?

All ravens are crows.
Not all crows are ravens.
Note size.
Distinguish shape of tail feathers.
Listen for their calls.

Now, apply the above to poetry & prose. Noting that beauty unifies.

Raining harshly this morning; it appears ravens & crows have self-grounded. Exploration of differences on temporary hold. Thus, haiku (the cat) sleeps.



About food. Huge difference between tuna (recognizable as fish) and tuna (contained in can). Both are tuna (I think).