the.com/horseshoe crab
a 450-million-year-old tank with blue blood that medicine still can't live without
blue bloodcopper-based hemocyanin, harvested to test vaccines for contamination
living fossilolder than dinosaurs, trees, and Saturn's rings
not a crabcloser kin to spiders and scorpions
ten eyessees ultraviolet and senses light across its body
flip survivoruses its tail to right itself, not to sting