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Scientists were and are continuing study of troops of macaques in Sri Lanka. They discovered that mother macaques who have male offspring supply richer and more caloric milk to their male offspring than to their female offspring.
This led other scientists to study human mother's breast milk, which also generate richer and more caloric breast milk to their male babies than to their female babies, dependent on their wealth and resources.
"..40-year-old theory in evolutionary biology. The Trivers-Willard hypothesis states that natural selection favors parental investment in daughters when times are hard and in sons when times are easy." Boys and Girls May Get Different Breast Milk
Scientists were and are continuing study of troops of macaques in Sri Lanka. They discovered that mother macaques who have male offspring supply richer and more caloric milk to their male offspring than to their female offspring.
This led other scientists to study human mother's breast milk, which also generate richer and more caloric breast milk to their male babies than to their female babies, dependent on their wealth and resources.
"..40-year-old theory in evolutionary biology. The Trivers-Willard hypothesis states that natural selection favors parental investment in daughters when times are hard and in sons when times are easy." Boys and Girls May Get Different Breast Milk
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