when we went out in the chicken coop to collect eggs, we found one of the rooster's spurs!!! we have two RIR roosters. We found out that it belonged to our rooster, Marty. But when we looked at where his spur used to be, it looked pretty strange. Kinda black colored, like it was infected and had fallen off. This doesn't seem normal. any ideas on what is going on or what it is? Thanks!