Question: how to tell the difference between a rooster and a chicken?
Answer: Feathers. Roosters often have distinguishing hackle or neck feathers and saddle or back feathers. ... 
Legs. Roosters often have thicker legs than hens and have pointed, sharp spurs. ... 
Wattles and Combs. Roosters usually have tall, upright and larger combs than hens. ... 
Coloring. Roosters often have showier plumage than hens.