This is one of the biggest ants in SE-Asia. The workers measure 2 cm and the soldiers ca. 3 cm.  Camponotus gigas gigas LATREILLE, 1802 Genus: Camponotus (carpenter ants, Rossameisen) Family: Formicidae (ants, Ameisen)  I found a small nest (#10-20) in dead wood. They are usually active at night. While shooting one bit into my ring-finger, several mm deep; I was impressed!  A handful of these ants may meet at night to engage in what is considered to be a ritual battle. These fights can continue for several months  (Wikipedia).  Indonesia, N-Sumatra, 65 km W Medan: vic. Bukit Lawang (Mt. Leuser NP), ca. 350m asl., 28.09.2010  (IMG_5334)