Reminds me of the work of the Human Interference Task Force, set up in 1981 to come up with strategies to provide necessary knowledge about the dangers related to active nuclear waste across several millennia to future generations. Françoise Bastide and Paolo Fabbri, two members of the Task Force, proposed breeding "radiation cats" that would change significantly in color when they came near radioactive emissions and serve as living indicators of danger [0]. In order to transport the message, the importance of the cats would need to be set in the collective awareness through fairy tales and myths, which the authors considered to be the most effective way to communicate with future generations.

[0] https://en.wikipedia.org/wiki/Human_Interference_Task_Force