Sentence:  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 <WSD>methods</WSD> for blending into one's visual background. 
Meaning of the word marked with <WSD> tags:  A process by which a task is completed; a way of doing something (followed by the adposition of, to or for before the purpose of the process):