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The idea of the chickens with the multiple breasts and thighs came from an urban legend that some fast-food places had developed chickens with four thighs. It wasn't true, but it is a suggestive rumor.

"Margaret Atwood Remixes Shakespeare’s “The Tempest” as a Prison Drama". Interview with Maddie Oatman, www.motherjones.com. September, 2016.
The idea of the chickens with the multiple breasts and thighs came from an urban legend that some fast-food places had developed chickens with four thighs. It wasn't true, but it is a suggestive rumor.