Sentence:  Nonetheless, some insect <WSD>prey</WSD> take advantage of clutter by hiding in it. Earless ghost swift moths become “invisible” to echolocating bats by forming mating clusters close (less than half a meter) above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them. 
Meaning of the word marked with <WSD> tags:  A living thing that is eaten by another living thing.