I'm trying to find a short story. Here is what I remember about the plot:

  • Shapeshifting aliens try to invade planet Earth. They have tried multiple times in the past, but every single time they lost contact with the attack team immediately after it landed on Earth
  • The story is told from the point of view of one such alien, part of a later invasion force
  • He lands on Earth, and notices the extreme biodiversity of the planet (compared to his own)
  • He soon figures out that the previous teams were not dead. They just found a niche in the ecosystem in which they could be an animal (or a plant, or anything really) that had the kind of life they always wished to have
  • However, this particular alien is a pilot. He loves flying. There is nothing in our ecosystem (or so he thinks) that could help him with this
  • The story ends with the Earth army storming the hiding place of the alien. They find nothing, other than a large bird (a goose?) slowly flying away. It looks like there was a niche for our particular alien, after all...

I read this story a long time ago (more than 10 years), but it is probably older than that. I have no idea about the original publication date. Most likely, I read it in one of Asimov's anthologies, but I don't know if he was the author or just the publisher.

  • I also read this story, probably in the 90s, and also remember it being in an Asimov related anthology.
    – Foo Bar
    Commented Apr 26, 2018 at 22:13
  • 5
    There isn't much info about it online, but 'Keep your Shape' by Robert Sheckley seems like a candidate.
    – user99274
    Commented Apr 27, 2018 at 0:11
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    @WilliamLio - thank you! I think that's it! And what's better, it has been published as part of Project Gutenberg in 2010 - so it was easy to find it again. If you post this as an answer, I will gladly accept it.
    – Bogd
    Commented Apr 27, 2018 at 5:44
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    Interesting. The version in the Nov 1953 issue of Galaxy has a slightly different ending than the one I remember. archive.org/stream/galaxymagazine-1953-11/Galaxy_1953_11
    – Foo Bar
    Commented Apr 29, 2018 at 17:10

1 Answer 1


I agree with the answer above in the comments that this is most likely the story "Keep Your Shape" (also titled "Shape") by Robert Sheckley. I'm writing this answer to explain that there are (at least) two versions of this story, with two different endings. The first version was published in Galaxy magazine (Nov. 1953) and is available at the Internet Archive and at Project Gutenberg. It ends with:

Then he set out after the Hawk, which was now only a dot on the horizon. He would find out how the Hawk had broken flight as it had—skidded on air—he wanted to do that too! There were so many things he wanted to learn about flying. In a week, he thought, he should be able to duplicate all the skill that millennia had evolved into Birds. Then his new life would really begin.

He became a torpedo-shape with huge wings, and sped after the Hawk.

The second version was published in Argosy (May 1955) and seems to also be the version included in Untouched by Human Hands, Is That What People Do? and Store of the Worlds. It ends with:

The Men raced to the window and stared out. But they were unable to understand what they saw.

There was only a great white bird out there, flapping awkwardly but with increasing strength, trying to overtake a flight of birds in the distance.

The second version is I think a better match to the questioner's recollection.

  • 1
    Incredible - I was remembering an ending about some great slow bird, and now (rereading the story after you guys helped me find it) I was really surprised to find the hawk sequence. I first blamed it on my memory playing tricks on me after all this time. Now, thanks to your answer, I know this is not the case, and I had read another version of the story. Quite a relief, to tell the truth... :)
    – Bogd
    Commented May 3, 2018 at 15:08

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