Q1:
CAT 2017 Slot 2
VA
Parasummary
Medium
The passage given below is followed by four alternate summaries. Choose the option that best captures the essence of the passage.
North American walnut sphinx moth caterpillars (Amorpha juglandis) look like easy meals for birds, but they have a trick up their sleeves-they produce whistles that sound like bird alarm calls, scaring potential predators away. At first, scientists suspected birds were simply startled by the loud noise. But a new study suggests a more sophisticated mechanism: the caterpillar's whistle appears to mimic a bird alarm call, sending avian predators scrambling for cover. When pecked by a bird, the caterpillars whistle by compressing their bodies like an accordion and forcing air out through specialized holes in their sides. The whistles are impressively loud they have been measured at over $80 \mathrm{~dB} from \5 \mathrm{~cm}$ away from the caterpillar considering they are made by a two-inch long insect.