The mandibles of many herbivorous insects have exceptional cutting abilities due to the presence of zinc or managese salts.

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"Many invertebrates use crystals of metal salts to harden their cutting, rasping, and grinding equipmentThe mandibles of herbivorous insects contain zinc or manganese salts (Vincent 1990)." (Vogel 2003:333)

Comparative Biomechanics: Life's Physical World, Second EditionPrinceton University PressJune 17, 2013
Steven Vogel

Structural Biomaterials: Third EditionPrinceton University PressJuly 29, 2012
Julian Vincent

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