.

In respect to this, at what age can you tell if a chicken is a rooster?

Crowing is a fairly good indicator, but isn't fail-safe, either, because some hens do crow. Plus, generally speaking, you will be able to tell by feathers much earlier since roosters don't usually begin to crow until they are 4 or 5 months old.

Also, why does a chicken have a wattle? Wattles are part of chickens' heat regulation system. They are unable to sweat. Instead they cool themselves through their blood circulation: the wattles and combs are thick with capillaries and veins for the overheated blood to pass through. It is air-cooled as it passes through these blood vessels.

Just so, do Hens have a comb?

Male and female chickens have different kids of combs. Males usually have a bigger comb. The comb size and shape is also different between different breeds of chicken. Combs are usually red, but they can also be purple in some breeds.

What age do chickens grow wattles?

At 16 weeks they hang down around 5/8." It likely varies from bird to bird, even within the same breed, as I have 2 RIRs; one has a nearly fully developed comb and wattles while the other's wattles and comb are seeming to just be developing and they're both 16 weeks old.