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"Laying eggs in winter in a cold climate doesn't sound like an evolutionary advantage to me" Humans shaped chicken evolution for roughly the last 3500 years. We provided selection pressure to lay eggs in quantities well beyond what jungle fowl lay. We wanted chickens to lay in cold climates...

Single comb is an advantage in hot climates. Light body size is also an advantage. Light colored feathers are another heat advantage. What about cold climate advantages? Pea comb, rose comb, cushion comb, and flat comb are all advantaged to different degrees in cold climates. But it takes a...