151 Walker was first identified as an independent two-year-old in 2009. He is a large adult male. He has a long, tapering muzzle and widely spaced, upright ears. In early summer, he has prominent dark eye-rings and in late summer his fur is dark brown. He arrived this spring with a large wound on his right hip that can still be seen.

151 Walker is a frequent user of Brooks Falls. He is one of the largest bears to use the river. His size and assertive disposition give him his choice of preferred fishing areas. He is a skilled angler at fishing the lip of the falls, something not many large, dominant boars do. His range of fishing spots are an indicator of his adaptability and skill. As a young adult, 151 used to play frequently, but now he prioritizes fishing over play. His many scars demonstrate the challenges of being a large, dominant bear.