Horseshoed Hero

Horseshoe crabs are heros,
Heres why theyre yours too,
This copper blooded isipod,
Who's blood is vibrant blue,

Today vaccines save lives,
But at one point they did not,
Gram negative bacteria,
Made its way into a shot,

In swooped this crab,
With a spike behind its back,
To find these dye proof germs,
An get us back on track,

So the FDA requires,
only a horseshoes best,
For any drug they approve,
to really pass the test,

So flip them if you see them,
Because theyre watching out for you,
Your super ancient hero,
Whose wicked heckin' cool -<[)

-ERS