A hiss is a sound made by many animals, including snakes, cats, and some birds. It is usually used as a warning or threat, and can be a sign of aggression.
Snakes are the most common animals to hiss, and they usually do it when they feel threatened. It's a way for them to defend themselves and make it clear that they don't want to be disturbed.
Cats also hiss when they feel threatened. It's a way for them to make it clear that they don't want to be approached or touched. Cats may also hiss when they are in a fight with another cat, or when they are trying to protect their territory.
Some birds also hiss as a defense mechanism. It's usually done by birds that are nesting, as a way to protect their young.
In addition to animals, some machines or appliances can also make a hissing sound. For example, a radiator may make a hissing sound when it is turned on, or a gas stove may hiss when it is lit.
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