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. 2021 Jan 13;7(3):eabd4648. doi: 10.1126/sciadv.abd4648

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Fig. 3 — (A) Digital tracing of the rock art panel (P10). (B) Pig 1. (C) Detail of the head area of pig 1 [enhanced using the Decorrelation Stretch (DStretch) computer program (44); channel setting: _ac_lab; AC, auto contrast and LAB color space]. HC, head crest; FW, preorbital facial warts. Pig 1 displays an unidentified morphological feature, a pair of teat-like protuberances in the lower neck area; these are highlighted by white arrows in (C). Photo credits: A. A. Oktaviana, ARKENAS/Griffith University.