They grow big here cause they hunt in packs an eat the walabies
Never seen one @ 2 1/2 inches, about an inch maybe. Biggest thing I ever saw was just after I came here in '81. I was working on a building site and we lifted a concrete ring with the crane and this centipede ran out, must have been all of 10 inches long and about 1 1/2 wide. Mate told me to step on it, but no fear, reckoned it would run off with me.