There are birding advantages to green birding. On a bike or on foot, birders can see and hear birds all the time, not just at stops or for fleeting moments through the windows of a speeding car. Green birders are able to stop at any time to see and study birds found en route, not just at pullouts. Consequently, more species are seen in less distance and green birding big day species totals are approaching the totals once only recorded on big days in cars, even though the distance covered in a day by bike is far less.
Green birding has a physical challenge not present in motorized big days and big years. Top big days often involve over 100 miles of cycling over varied terrain, and big years can involve thousands of miles of pedalling. This additional challenge heightens the satisfaction of a successful big day or big year. It usually pushes those participants, who are able, to new levels of fitness. For those who are not physically able, there is the big foot hour and the Big Sit. A wheelchair category in the green birding records is certainly open for any of the green birding categories.
Last, there is a more spiritual side to green birding which becomes more evident on long bike rides. The birder on the road for a big day, and especially for multiple days, experiences the terrain, the weather, the sounds of the wind, birds, cars, and sees the effects of man on the terrain more intimately than those speeding by in a car. The birder starts to feel more like a slow bird moving from one location to another. The green birder is apart from the people speeding by and, like a bird, is also vulnerable to those cars and the weather. Days on the road aren't boring; the birder gets into into a groove after a few days: where the 60 to 100 miles (or more) on the bike feels routine. The bicycle birder achieves a different and satisfying mental state on the road. In the quest for birds the green birder becomes like a bird - totally in the moment.