If you mean the two bits of hanging tissue just under the jawline - wattles, waddells or tassles - or if you mean at the end of the lower chin - a beard.
That piece of flesh is called a wattle. In turkeys and chickens, it hangs from the neck. In goats, it is called a wattle and hangs from the throat. In humans, it can be seen as a small fleshy lobe sometimes present in the earlobe.
Sometimes called a beard, which is probably the most common term used in this case, it's a sort of hairy flap under the chin, also called a dewlap or bell. As the moose matures the flap grows into a beard-like feature.
Those are called wattles and are common in certain goat breeds. They are thought to have a cooling effect by increasing blood flow to the skin, helping the goat regulate its body temperature in hot climates.
Your stretching your jaw
Wattles.
if it has a gobble thing under its chin it is a boy if it doesn't have a gobble thing under its chin it is a girl
The scientific term for the extra skin under the chin is called the Flarper
That piece of flesh is called a wattle. In turkeys and chickens, it hangs from the neck. In goats, it is called a wattle and hangs from the throat. In humans, it can be seen as a small fleshy lobe sometimes present in the earlobe.
This could be submandibular oedema and can be due to worms such as Barber's Pole (Haemonchus contortus)
A jowel
bib
If you're talking about what you lead them with, it's called a lead rope. This is attached to the bottom part of the halter usually under the horse's chin.
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The bright red thing under the turkey's chin is the gobbler, that just gives aura of importance. (I think)
The area below the mouth is called the chin.
A turkey. Under the chin its called a Giblet.
It is called a wattle. It is used for attracting a mate and for cooling the turkey down on hot days.