The "feather" in the phrase "lighter than a feather" refers to the down on swans, also known as velvet. Since velvet is very soft and light, "lighter than a feather" is used to describe something very light and lightweight. It should be noted that "feather" itself is not an animal's hair, but just a metaphor.
animal tags： swan
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The stick insect's body is bright green. When they perch on a branch, they look no different from a dead branch. Not only that, the body color of stick insects will change with the changes in the surrounding environment, sometimes green, sometimes brown, and sometimes yellow....
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