Still January 14, 2011 After caving, we went down at the side of Pinacanauan River to witness the Circadian Flight of Bats. While waiting for it, I am taking pictures of the river. Based on wikipilipinas “Pinacanauan River is one of the largest tributaries of the Cagayan River, the longest, widest and most powerful river in the Philippines. Its name comes from the local term pinacanauan, which means “left-most.” It…