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Earth's land Mammals by weight
(imgs.xkcd.com)
A place to share and discuss data visualizations. #dataviz
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It's specifically a visualization of land mammals, so chickens wouldn't appear, being birds.
I think the argument was chickens not being mammals.
I'm pretty sure they were domesticated from something (a South Asian jungle fowl, I believe) to the extent that they are no longer even the same species. So any "wild" chickens would just be feral escapees.