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"Alien organisms" is a speculative-fiction category centered on nonhuman life—extraterrestrial plants, animals, microbes, or sentient biologies—and the ways those life forms shape, threaten, or illuminate human experience. Stories range from hard-science xenobiology and first-contact narratives to invasion and body-horror tales, exploring themes of ecology, adaptation, communication, ethics, and the uncanny. Settings include distant planets, derelict spacecraft, secret labs, and near-future Earth, and tones can be wonder-filled and philosophical, tense and suspenseful, or gruesome and horrific. The category appeals to readers fascinated by speculative evolution, the limits of life, and the moral and practical consequences of encountering truly alien biology.

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