It gets really hot here and I've never found the comb size on my birds to exceed the "normal" comb size of any breed
Definitely different lines. Some in different parts of the world. All are kept by long time Marans breeders so I don't think any came from hatcheries.For the Marans: were they from the same line of Marans?
If they all came from the same hatchery in the same year, then were raised in different parts of the country, that would be stronger evidence that environment has an effect.
But if they were from different breeding lines, it could just show that breeders in different parts of the country have selected in different directions-- maybe even inadvertently, by breeding from the brids that thrive in their climate.
Was just an observation of a limited amount of birds and breeders. Not a scientific study by any means. That would need controlled groups grown out at particular times of year.
Was just curious about Jacin and Mystery's birds since they are in colder climates and seems most of the country has had at least some excessive heat.