A group of organisms that are scarce. Although it can be designated by an official body such as a government, unlike endangered or threatened, it is used more unofficially and without specific criteria. Usually rarity is used to refer to species with fewer than 10,000 organisms worldwide.

Trees in Autumn
Four-toed Salamander
The four-toed salamander is called the four-toed salamander because it has four toes on its hind feet.
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