crypsis
The ability of an organism to avoid observation.
uncountable
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.
Where it comes from
Probably directly from Ancient Greek κρύψις (krúpsis, “hiding, concealment”); compare Latin crypsis. Doublet of krypsis.
Adapted from the Wiktionary entry crypsis (CC BY-SA 4.0).