Humans have near but exactly 1:1 ( 1.05-1.07 favoring males at birth ). Fisher's principle[1] explains why this 1:1 is common. There is big imbalance problem f

Humans have near but exactly 1:1 ( 1.05-1.07 favoring males at birth ). Fisher's principle[1] explains why this 1:1 is common. There is big imbalance problem for humans as well, many cultures prefer male children over females, the two largest countries - India and China have big imbalance for different reasons there is estimated 100 million less girls than boys in these two countries alone as result of sex selection/ infanticide etc . [1] https://en.wikipedia.org/wiki/Fisher%27s_principle https://en.wikipedia.org/wiki/Fisher%27s_principle