Up the Walls of the World - James Tiptree, Jr. - 1979 Berkley Paperback

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Publisher blurb: "A complex science fiction story of a secret military research project involving the investigative powers of the mind and their possible strategic applications and a distant planet which is being threatened by a monumental interstellar entity.

Humans who have shown indications of telepathic ability make mental contact with the Tyrenni, strange alien beings resembling winged squids who dwell in the upper atmosphere of their tempestuous world. But the Tyrenni are threatened by a huge being and forced into the decision to take over the bodies of their human contacts..."