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AH_Sumatran Pitviper Trimeresurus sumatranus_2606.jpg
Sumatran Pitviper (Trimeresurus sumatranus), smelling the air by flicking its forked tongue. The forked tip of the tongue allows the snake to smell in 'stereo', allowing it to determine the direction a scent is coming from. Danum Valley, Sabah, Borneo. June.