At the night in Nonggang National Reserve, Guangxi Province, China, Aplosonyx nigriceps Yang knew that the leaves of Alocasia macrorhiza secreted toxin alkaloids, so he adopted a smart and flexible tactic when eating the leaves of Alocasia macrorhiza, which was called "drawing circles". It drew circles about 3cm in diameter on the leaves of Alocasia macrorhiza, cut off the leaves' meridians to transmit toxins, and then it ate the leaves without poison in the circle.