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"Alien races" as a book category centers on stories that imagine intelligent nonhuman species—their biology, cultures, languages, technologies, social structures and interactions with humans or other species. It spans first-contact and interspecies diplomacy, xenophobia and coexistence, exploration of alien perspectives, and conflicts ranging from intimate cultural misunderstandings to galactic wars. Books in this category use speculative worldbuilding to probe questions of identity, morality and what it means to be sentient, and appear across subgenres (hard science fiction, space opera, military SF, cosmic horror, and even fantasy). Readers can expect a mix of imaginative biology, anthropology, politics and ethics, with tones that vary from wonder and humor to philosophical or chillingly alien otherness.

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