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The answer to this question is quite practical. During long gone days the sailors used to relate story telling about giant squids and octopus due to which people always used to be afraid with creatures having long tentacles.

In the early cinemas depicting such aliens directors used such costumes which was both easy as well aroused a sense of danger.

It also leverages on two other primordial fears of man, that of snakes and Spiders. Evolution taught us to stay away from things with multiple legs and long ropy-like creatures, as they can kill us.

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Q: Why do many movies and TV shows about alien invasions seem to feature spaceships with long tentacles hanging off the bottoms?
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