It's a biological thing and there's plenty of research on it. And there _is_ evidence of "poor adaptation." https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1

It's a biological thing and there's plenty of research on it. And there _is_ evidence of "poor adaptation." https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1440-1819.1999.00481.x https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1440-1819....