Skin color is the best biological predictor of IQ.
https://www.sciencedirect.com/science/article/pii/S0160289613000949
"Relationships Between Skin Reflectance and IQ in Japan and the United States" by Donald I. Templer and Hiroko Arikawa
Recent research in genetics demonstrates that certain racial, and also ethnic, categories have a biological basis in statistically discernible clusters of alleles.
http://stx.sagepub.com/content/30/2/67.abstract
The average African IQ is estimated at 75.
http://www.sciencedirect.com/science/article/pii/S0191886912003741
The average African-American IQ is 85, compared to the average White IQ of 100.
http://www.udel.edu/educ/gottfredson/reprints/1997mainstream.pdf#page=2
The average Black has an IQ score 1 standard deviation (15 IQ points) lower than the average White.
http://www.gifted.uconn.edu/siegle/research/correlation/intelligence.pdf
Blacks are more prone to psychopathy and less capable of empathy than Whites.
Blacks are 80% more likely than Whites to neglect their children.
Blacks have less moral understanding that Whites.
Blacks are more reckless than Whites.
Blacks are twice as likely to subject their children to severe violence than Whites.
Black women are more than twice as likely as White women to abuse their husbands.
Black youth are two and a half times as likely as White youth to have raped someone.
Blacks are more likely to kill their spouses than other races.
Blacks are 50% more likely to cheat on their spouses than Whites.
Blacks have less perseverance than other races.
http://www.sciencedirect.com/science/article/pii/S0191886901000290
