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Humans aren't the only ones who use tools. Other animals also find tools helpful. Octopuses use two halves of a seashell to provide protection or a place to hide. And despite sometimes being thought of as simple, many birds make clever use of tools as well. New Caledonian crows are well known for creating hooks and spears from twigs. Furthermore, palm cockatoos have been observed using leaves to pad their beaks when opening nuts.