Birlers Perch is a term used to describe the job of a LOG driver, which is someone who transports logs downriver. The term is derived from the German word 'birler, ' meaning 'one who drives logs.' LOG drivers were an important part of the timber industry in the 19th and early 20th centuries, as they were responsible for transporting logs from the forests to the sawmills. LOG drivers had to be skilled in navigating the river and maneuvering the logs, and the job was often dangerous due to the unpredictable nature of the river.