You are referring to the Wattle...It is a red flap of "skin" that hangs down under the beak.
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The thing on a rooster's neck is called a wattle. It is a fleshy, carunculated growth that hangs down from the bird's neck.
A dewlap or bell
The name of a rooster's neck is......... Anymore quetions
The gender of chicks is often difficult to determine at a young age, but there are some methods like examining their feathers (roosters may have thicker, faster-growing wing feathers) or behavior (roosters may become more aggressive as they mature). However, the most reliable way to determine the gender of chickens is through a process called sexing, which usually requires professional help.
A cat's neck is called a "cervical" region.
The hair on the horses neck is called a mane.