The World Conservation Union (IUCN) lists one species of sticklebacks, seahorses, and their relatives as Critically Endangered and one as Vulnerable. Critically Endangered means facing an extremely high risk of extinction in the wild. Vulnerable means facing a high risk of extinction in the wild. The U.S. Fish and Wildlife Service lists one species as Endangered, or in danger of extinction throughout all or a significant portion of its range.
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