1922, Ben Travers, A Cuckoo in the Nest Chapter 1, “… the awfully hearty sort of Christmas cards that people do send to other people that they don't know at all well. You know. The kind that have mottoes.... And then, when you see senders, you probably find that they are the most melancholy old folk with malignant diseases. …â€
2013, William E. Conner, An Acoustic Arms Race, Earless ghost swift moths become “invisible†to echolocating bats by forming mating clusters close...above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them. Many insects probably use this strategy, which is a close analogy to crypsis in the visible world—camouflage and other methods for blending into one’s visual background.
