Subject: That was based on medieval myths, actually.
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Posted on: 2015-05-30 04:47:00 UTC

Roosters really were executed due to supposedly laying eggs back in the day for precisely this reason. According to Wikipedia, "The Venerable Bede was the first to attest to the legend of the birth of a basilisk from an egg by an old cockerel, and then other authors added the condition of Sirius being ascendant."

The HP wiki says that any chicken's egg can be used to make a Basilisk if it's hatched by a toad, though, so I'll defer to the HP continuum first in that case.

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