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Their tongues are another fascinating adaptation. Many woodpeckers have long, barbed tongues that help them extract insects and sap from deep within tree crevices. Some species even have tongues that are sticky with saliva, which aids in catching prey. Woodpeckers are primarily insectivorous, feeding on a variety of insects, including beetles, ants, and caterpillars. Their method of obtaining food is perhaps their most iconic behavior - pecking and drilling into trees. This not only provides them with food but also helps in creating nesting holes.