In a general manner it refers to a pendulous flap of skin which has no purpose for humans. For some frogs it contains the vocal sac. In lizards it is used as a form of communication to attract a mate and in other animals it may, or may not, indicate status
The dewlap could be an advantage for a cow in defense of predators that may try to go for her throat. It's an advantage in that instead of the predator getting the jugular vein, they get a mouthful of skin.
A dewlap or bell
breeding and territorial reasons
Male rabbits do not have a dewlap; it is a feature typically found in female rabbits. The dewlap in female rabbits is a loose fold of skin under their chin and serves multiple functions, such as storing fat reserves, aiding in regulating body temperature, and providing cushioning during nursing.
It is called a dewlap. They use it to attract the opposite sex and intimadate other males as well as some predators.
Highland cattle would be Bos taurus - they have thick coats of hair, small ears, a compact body and a small dewlap. Bos indicus cattle have the opposite - thin fine coats of hair, large ears, a rangy body and a large dewlap. These adaptations are to help cool the Bos indicus cattle in subtropical climates.
I don't think these are Angus cattle. However, it could be a very mature Angus bull with a pronounced dewlap, but my hunch is that you're looking at Black Simmental cattle with an even heavier dewlap (which is typical of all Simmentals). Today, Simmentals are getting to be looking more and more like Angus because of the Angus genetics being put in to these full-blood Simmentals.
In most breeds the doe has a dewlap and a buck is disqualified if it has a dewlap. Some breeds do not have a dewlap at all. A doe will have a dewlap by the time she is breeding age (which is 6 months:)
No, several other animals have a dewlap
Cattle, rabbits, Elands and many other larger antelope species...some humans. There are other animals as well.
a turkey's dewlap is the flap of skin under its neck. Also called a Wattle.
Brahma cattle is a domestic breed developed from Indian stock. They have a hump between their shoulders and a dewlap. Angus is a breed of hornless cattle originating in Scotland. They have low, compact bodies and are known for their prized flesh.
The dewlap could be an advantage for a cow in defense of predators that may try to go for her throat. It's an advantage in that instead of the predator getting the jugular vein, they get a mouthful of skin.
Anoles
It's the female rabbits that have the extra fur. It's called a dewlap. It's different from the dewlap of other animals in that it's fatty, and the mother rabbit plucks fur from her dewlap to line her nest for her babies.
dewlap or caruncle
dewlap