Among sailors, it is considered unlucky to kill a ...
albatross
Arctic tern
penguin
herring gull
The albatross as a superstitious relic is referenced in Samuel Taylor Coleridge's well-known poem The Rime of the Ancient Mariner. It is considered very unlucky to kill an albatross; in Coleridge's poem, the narrator killed the bird and his fellow sailors eventually force him to wear the dead bird around his neck.
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