When threatened, newly hatched warty birch caterpillars vibrate and perform a series of complex behaviors to defend their territory from intruders. This research, published in the Journal of Experimental Biology, reveals their unique drumming and shaking techniques, which can produce vibrations comparable to a lion's roar despite the caterpillars' tiny size. Their warning signals usually deter intruders, but if not, they can quickly escape by dropping a silk thread and fleeing. This study emphasizes the intricate sensory and communication abilities of even the smallest organisms, enhancing our understanding of their behavior and environment.
The caterpillars start furiously drumming their heads, shaking their bodies and scraping their butts against the leaf, signaling that their leaf tip is off-limits.
For such small caterpillars, [their vibrations] are like lion roars...you have to turn down the volume and take the headphones off your ears because they’re so loud.
These vibrant warning signals often deter intruders, allowing the caterpillars to protect their territory effectively and remain safe.
The research highlights the complexity of communication in small organisms and expands our understanding of their sensory experiences.
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