RE: Spur length ?
depends on the part of the country and the terrain in which they live.
country with hard rocky,hilly land will have less spurs than a bird that lives in a river bottom with no rocks and mainly soft soil.
the hard rocky land will keep the spurs wore down some what.
I am not a hunter I am a whitetail population reduction specialest
remember keep your back to the sun, your knife sharp, and your powder dry.