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. 2009 Aug 5;4(8):e6471. doi: 10.1371/journal.pone.0006471

Figure 1. Proposed terminology for classifying different types of animal tool use.

Figure 1

The present study investigated sequential tool use, which falls under the broad category of ‘meta-tool use’, and more specifically can be thought of as a type of ‘secondary tool use’. Depending on the number of tools used, sequential tool use can be further divided into two-tool, three-tool, and n-tool sequences. For a detailed discussion of terms, see main text.