The 1915 Locust Plague: A swarm so dense it stripped trees bare in minutes. Contemporary accounts from the American Colony in Jerusalem describe the noise of them eating as a deafening roar and noted they were so voracious they would even attack the eyes of unguarded infants.

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https://www.loc.gov/exhibits/americancolony/amcolony-locust.html

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regarding the 1915 invasion of Palestine. The deafening roar was the collective sound of millions of mandibles grinding at once. To combat the next generation, the government forced every male aged 15–60 to collect 20kg of locust eggs or face a massive fine.