Ray cat
A ray cat is a proposed kind of cat that would be genetically engineered to change appearance in the presence of nuclear radiation. Philosophers Françoise Bastide and Paolo Fabbri originated the idea of a "living radiation detector" in 1984 as a proposed long-term nuclear waste warning message that could be understood 10,000 years in the future, building on the Human Interference Task Force's idea of oral transmission of radiation's dangers.